Knife Review: Lionsteel T5 MI

Each year at IWA, there are a few blades that stand out and draw you back to them time and again. Lionsteel’s T5 was one of those, and may well have been my most visited blade at IWA 2017. I’ve been fortunate enough to be able to spend a lot more time with it subsequently, as well as being able to discuss its design with Mik Molletta, the man behind this outstanding knife.

The Blade and Handle Geometry:

Most knife specifications have a basic description of the blade geometry, but in this section I will be taking a more detailed look at geometry and balance.

Using a set of gauges and precision measuring equipment including a Vernier protractor, callipers, fixed radius gauges and the unique Arc Master adjustable radius gauge (the one that looks like a crossbow).

These measurements have been tabulated and are presented along with a few reference blades (8″ Chef’s Knife, 5.5″ Santoku and the popular Fällkniven F1).

Key aspects such as the primary bevel angle, grind type, blade depth, blade thickness, length, weight are detailed, along with balance information.

The ‘Balance relative to the front of the handle’ tells you if the knife will feel front heavy, or if the weight is in your hand (a positive value means the weight is forward of the front of the handle). The ‘Balance relative to the centre of the handle’ indicates how close to a ‘neutral balance’ the knife has in the hand.

In the case of full convex grinds the approximate centre of the grind is used for the primary bevel angle estimate.

The blade is made from Niolox steel.

New for 2018! BESS Certified sharpness testing:

The BESS ‘C’ scale of sharpness, developed by Mike Brubacher (Brubacher Edge Sharpness Scale) will now become part of Tactical Reviews’ knife testing process. Initially this will be used to verify the sharpness of the factory edge and allow the knife to be brought to a minimum standard sharpness before testing a blade’s cutting performance.

The Lionsteel T5’s factory edge has an average BESS ‘C’ sharpness of 233. This original edge cleanly slices 80gsm copier paper with an edge cut, but won’t quite push cut it. It slices into the rounded edge of a doubled over sheet of the same 80gsm paper. It also will catch the edge of green Rizla paper and slice halfway through (cross ways), but not all the way.

Explained by the Maker:

The reasons for certain design choices may not be clear when simply looking at an object, so this section is intended to give an insight into the thinking behind a design by speaking to the designer themselves.

Mik Molletta, kindly agreed to go through many of the design aspects of the T5 and despite a language barrier, Mik has helped with the questions I put to him. These are the marked up images that allowed us to pick out details to discuss.

The following is derived from the points we covered. Not every label has a comment:

As with many other projects, it was Lionsteel who approached Mik regarding designing a multi-role compact knife. In this case the inspiration was from talking with soldiers who need a compact multi-role knife, and this was what determined the blade length (A), as it is a good length for bushcraft and survival work.
The blade tip (B) is positioned above centre line so that as well as survival duties, it will also be suitable as a hunting knife.
To best fit with the aims of this project and its multi-use capabilities, Mik chose a ‘straight’ knife without any rake (F).
Being a multi-purpose knife, a flat grind has been chosen as this is the best solution for a blade that has to do various jobs. The blade steel, Niolox, was selected for its fine structure, good wear and toughness.
It is specifically balanced (I) for agility ease of handling and control. Texturing on the handle (K) is not merely a remnant of machining the shape of the handle, but was intentionally applied with a CNC template to give this pattern.
The T5 uses a distinctive and unusual one piece handle (L) which increases stability, precision and overall durability. In terms of the handle contours and the amount of palm swell (M), as if often the case, it’s what the designer themself finds comfortable that gets chosen.
Blade thickness (N) at 5mm is intended to still provide excellent strength for the length of blade. The extended swedge (O) reduces the blade section without weakening the tip.

Moving onto the other labelled photo of the sheath:

Though the use of a double row of stitching (P) adds to the size of the sheath, although the welt does protect the stitching from the blade, the double row increases the durability and life of the sheath so is an acceptable trade off for a little increase in size.
It is very unusual to have a MOLLE compatible (R) leather knife sheath and the use of leather was dictated by the absence of noise compared to other options. How you carry your knife is very personal so the MOLLE compatibility was added so it can be attached to a backpack or to a belt.
There is a hole behind the MOLLE strap (S) which doesn’t look right for a drainage hole as it is too high, but this is actually a construction hole simply used during assembly of the sheath.

A few more details:

The T5 arrives in a cardboard box.

Inside, the sheathed T5 is otherwise unwrapped.

Along with the T5 is a small leaflet.

However, the blade is wrapped inside the sheath.

You can see that the plastic wrapping was not terribly successful, as the blade has just sliced through it when it was inserted into the sheath.

A very nice quality leather sheath is used for the T5.

The leather is double stitched for maximum durability and lifespan.

The maker is cleanly embossed into the leather.

Here the information leaflet is slipped into the belt loop to better show its position.

Very unusually, this leather sheath has a MOLLE compatible mount.

The MOLLE strap is very snug in the loops, so not the easiest to weave onto webbing. You won’t want to move this more than necessary.

A great looking knife and sheath. This is why I kept revisiting Lionsteel’s stand at IWA 2017.

The steel specification is engraved into the blade – NIOLOX. An increasingly popular steel.

A close-up of the blade tip.

Almost the entire blade length has a swedge to help reduce weight.

The flat grind is very high, but not quite a full flat grind.

Only visible along the back of the handle, there is a full length, full thickness tang.

Sculpted from a single piece of micarta, the handle has a wide and comfortable finger guard. The cutting edge is nicely terminated with a sharpening choil.

Grip texturing is machined into the handle surface.

Two stainless Torx bolts secure the handle to the tang.

Looking through the lanyard hole, you can see the hole doesn’t go through the tang itself.

The tang protrudes from the end of the handle providing a hammering surface.

A minimal amount of jimping is included next to a thumb rest.

With a well rounded plunge line, maximum strength is retained.

Excellent attention to detail in the sheath with a protective cover over the internal part of the rivets. Doing this prevents the handle being scratched by the metal fixings.

The sheath wraps around the base of the handle providing a very secure hold on the knife. Unfortunately this makes the sheath only suitable for right handed users.

An extremely refined package.

This really is something special.

What it is like to use?

I’m going to start with that beautiful and well thought out leather sheath. Fortunately I am right handed, so this presents me with no issues, and I hope Lionsteel will offer a left handed version of the sheath.
It is the first MOLLE compatible production knife leather sheath I’ve come across, and makes an excellent change from the typical MOLLE compatible sheaths. Some MOLLE mounts are more of a struggle to use than others, and this sheath is a bit of a battle to fit. It is definitely worth planning out the position carefully as I did not enjoy fitting or removing it. The webbing on the sheath that fits over the leather MOLLE strap is quite tight, and catches firmly on the edge of the press stud when you try to slide the strap out. Easy enough when the sheath is not mounted, but definitely a struggle when trying to unmount it.
The sheath wraps over the first part of the handle with the retaining strap fitting above the finger guard. This over-wrap serves two purposes, the first is a very secure hold on the knife, and the second is that the over-wrap helps keep the retaining strap out of the way of the blade edge as it is sheathed and unsheathed.

With its 5mm blade stock, the T5 has a bit of weight to it, but that fantastic sculpted handle allows it to sit in your hand so comfortably. For a multi-purpose blade, the extra weight from the thick blade is the small trade off for the gain in strength and robustness you want in a blade that might be used for just about anything.

Handling really is excellent, and there is a thumb rest on the blade spine just in front of the handle where the spine is full width making it comfortable for the thumb to press onto for penetrative cuts, or for fine control when carving. The finger guard in that well sculpted handle is also very comfortable to bear onto for additional control on certain cuts. With the light and decorative grip texturing on the handle, I found this very effective but not aggressive. No hotspots have been apparent during use, and it is comfortable for extended use.

Factory edges are a subject unto themselves, as for some it is the best edge they ever have on that knife, and for others the worst. On the T5, the factory edge was impressive, and definitely usable out of the box. Due to the blade thickness, the edge bevels are quite wide and this will only get more pronounced with further use, but is the norm for blades of this thickness.

Mik Molletta has done Lionsteel proud with this design, and Lionsteel have done Mik Molletta proud with the quality of manufacture of his design, and this knife, that stood out from the crowd at IWA 2017, continues to impress the more I use it. The full package is a pleasure to use, and has put itself firmly into my top 5 favourite fixed blades.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________ _______________________________________________
Things I like What doesn’t work so well for me
_______________________________________________ _______________________________________________
Sculpted one piece micarta handle. Sheath is right handed only.
Strong 5mm blade stock. MOLLE Strap more fiddly than most.
NIOLOX steel. Thick blade results in a wide edge bevel.
Super quality, double-stitched leather sheath.
High Flat Grind, multi-purpose blade.
MOLLE compatible sheath.

 

Discussing the Review:

The ideal place to discuss this reviews is on a forum. If you started reading the shorter forum version of the review, but followed the link this full exclusive review, please return to that forum to discuss the review there.
If you read the review entirely on Tactical Reviews, please consider one of the following to join in any discussion.

BladeForums – Knife Reviews (US based Forum for Knife Discussion)

CandlePowerForums – Knife Reviews Section (Largest and Friendliest Flashlight Community Forum)

Knife Review: Extrema Ratio MAMBA

Extrema Ratio are well known for making knives that are built like a tank; heavy duty fixed blades and folders that will take everything you can throw at them in their stride.
When the new Mamba arrived for testing it was clear this was something quite different; I was struck by how slim this knife is, and by the special sheath with quick release lever locking system – a sheath so slim it is MOLLE compatible because slides directly into the loops of PALS webbing.

The Blade and Handle Geometry:

Most knife specifications have a basic description of the blade geometry, but in this section I will be taking a more detailed look at geometry and balance.

Using a set of gauges and precision measuring equipment including a Vernier protractor, callipers, fixed radius gauges and the unique Arc Master adjustable radius gauge (the one that looks like a crossbow).

These measurements have been tabulated and are presented along with a few reference blades (8″ Chef’s Knife, 5.5″ Santoku and the popular Fällkniven F1).

Key aspects such as the primary bevel angle, grind type, blade depth, blade thickness, length, weight are detailed, along with balance information.

The ‘Balance relative to the front of the handle’ tells you if the knife will feel front heavy, or if the weight is in your hand (a positive value means the weight is forward of the front of the handle). The ‘Balance relative to the centre of the handle’ indicates how close to a ‘neutral balance’ the knife has in the hand.

In the case of full convex grinds the approximate centre of the grind is used for the primary bevel angle estimate.

The blade is made from ACCIAIO BöHLER N690 (58HRC) steel.

A few more details:

The slimmest Extrema Ratio box I’ve come across.

Taking the lid off; this is how the Mamba arrives.

Included is the Mamba and sheath, with a quality control card and a couple of leaflets.

This really is something different from Extrema Ratio. Recognisable in styling, but definitely distinct.

One of the outstanding features of the Mamba is the quick release lever locking system. This is not a new system as it is used in many diving knife sheaths and a few specialist designs, but it is one I’m a real fan of. Easy and quick to use and very secure.

Simply press the lever inwards to release the knife. With the lever pressed in, its wire spring is pushed away from the sheath slightly.

The very unusual sheath has two adjustable plastic clips. They can also be reversed to make the sheath left or right handed. Of course these are used to secure the sheath in place when inserted into PALS webbing.

With the clip removed from the sheath you can see the internal locking lugs. One side is open and has finger tabs to allow you to open it further for adjustment or removal.

All along the sheath are holes for the adjustable clips to lock into. Should you just want a super low profile knife, you can take the clips off and use the sheath like this.

A distinctive design feature of Extrema Ratio knives is the finger grip recess in the Forprene handle.

There is a single bolt holding the Forprene handle in place. The screw is a tight fit, and even when fully loosened does not fall out; you will have to undo it and pry it out to take the handle off the full tang.

The full tang protrudes slightly from the end of the handle giving you a small striking surface.

On the spine, near the handle, the model is printed onto the black MIL-C-13924 burnished blade finish, and next to this is the notch that the locking lever fits into to hold the knife in the sheath.

The spine is flat for its entire length. This is an important detail in the operation of the lever lock.

On the right side of the blade it has ‘Extrema Ratio’ printed onto the black finish.

And on the left “58 HRC” is prominently printed with ” Stainless Cobalt Steel” printed underneath.

As a key design characteristic of the Mamba is that it fits into PALS webbing loops, the sheath is the starting point for this design. With the sheath fitted in PALS webbing, you want quick access to the blade and one-handed operation, both of which make the lever lock an ideal choice.

Taking a close look at the side of the lever that touches the knife, you can see several details. The lever has a pivot pin as well as a second pin to restrict the rotation of the lever. At the left end of the lever is the locking lug that fits into the notch in the blade spine. This lug is showing wear of the black coating where it rubs against the spine. Also showing wear is an area to the right of the lever where it gets pressed into the jimping when releasing the knife. Also note the shaping of the plastic sheath which supports and holds the blade end of the handle closely when the knife is locked in place.

When seen with the deep jimping on the spine, the locking notch doesn’t stand out at all as it is the same size and shape as the rest of the notches in the thumb grip.

Another view of that locking notch.

Though a relatively slim blade, there is a full length fuller cut into the full flat grind.

Having a strong Tanto tip, the edge bevel does widen towards the very tip.

Even in this slim blade there are refinements including a nicely angled plunge line and sharpening choil.

What it is like to use?

For a couple of main reasons, the Mamba has been a bit of a revelation. When I first saw it, I didn’t think all that much of it, but I was wrong, it really works.

The first of those reasons – the quick release lever lock. I’m so pleased to see this in a non-diving knife as it is one of those features I’ve been crying out for in ‘normal’ sheath knives.

A thumb release lever lock is so intuitive and easy to use as you basically free the blade just taking a normal hold on the handle. Your thumb sits onto the lever instead of the jimping and you squeeze to withdraw the blade.

The lever lock does require a slightly different technique when withdrawing or inserting the blade into the sheath. I mentioned this earlier in relation to the full flat spine. You need to keep the spine pressed into the locking lever as you withdraw or insert the blade. If you don’t, the sprung lever pushes the cutting edge into the opposite side of the sheath, both dragging on the blade, and cutting into the plastic. A slight pressure of the blade spine onto the lever and the blade glides in and out easily.

While mentioning ‘gliding’; actually the finish on the blade when new is so matt, it is slightly rough and in certain circumstances, this does actually cause some drag during a cut or when wiping clean. The surface finishing from Extrema Ratio is excellent, and hard wearing, so this ‘feature’ may simply be more noticeable on the finer blade of the Mamba than it is on larger, heavier knives.

There is one major disadvantage with the lever lock design; should you accidentally insert the blade into the sheath the wrong way round, the cutting edge runs directly onto and along the metal locking lever which will seriously damage the cutting edge.

Once in the hand, the Mamba is similar in size to flatware (a table knife) but is clearly something much more serious.

Though it has a slim grip, the finger grip in the handle, combined with the deep jimping under the thumb, give you a really secure hold on the knife.

Of course the main reason for the slim design of the Mamba is so that it, and its sheath, can fit into PALS webbing (so is MOLLE compatible) for ease of integration into your gear. Many people carry a knife in their PALs webbing, but either have a folder clipped onto it, a large knife with MOLLE compatible sheath, or (something that makes me cringe) in some cases an unsheathed knife slipped into the loops.
Here I’ve got it fitted to a MOAB 6 bag, but it works even better on the shoulder strap of a backpack.

Before fitting, take off the clips and try the sheath in the position you are considering, and check your thumb will land on the locking lever. Then refit the clip nearest to the handle and try once more to check it all works. There is a good reason for checking how well it works at this point.

When mounted, the adjustable clips are positioned so that they hold onto one line of webbing. The clips need to be opened on both sides of the sheath to be able to slide, so fitting can be a bit awkward. This is due to the clip near the tip of the sheath having very little room to move as it is pressed against the bag/load carrier on one side. You don’t want to have to do this many times, hence the earlier trial fitting I mentioned.

Although you have to fight with one of the clips to fit the Mamba into PALS webbing, the tapered tip of the sheath slides through the loops very easily.

So, being designed to fit into PALS webbing, compared to the Extrema Ratio ‘standard build’ for a knife, it is quite a bit smaller. To give an idea of this, here it is next to the Extrema Ratio TASK J.

And unsheathed as well.

Initially the Mamba is not a knife I would have been that excited about; a slim knife designed to fit into PALS webbing. Useful maybe, but not that exciting. This is certainly not how I feel about it now after spending time with it.

In many ways, Extrema Ratio got me hooked with this one by using the lever lock. I just hope they introduce this for a few other models, including the larger knives. On top of that is the fact that the more you use knives, the more you realise you don’t need as much knife as you thought you might. So, often people carry around seriously heavy duty tools that are never really put to use. In terms of cutting power, the Mamba is more than capable of most everyday jobs and its slimmer blade (though not weak at 3.8mm thick) makes many cutting jobs easier. It really is a multi-purpose ‘utility blade’, in all the best possible meanings of that term.

If only Extrema Ratio could include a belt loop fitting, perhaps sliding over the sheath like the MOLLE clips do, as I would like to be able to carry the Mamba securely without a load carrier or backpack. Light, slim, easy to work with and an excellent quick release lever lock for sheath retention, I’ll be carrying this whenever I can.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________ _______________________________________________
Things I like What doesn’t work so well for me
_______________________________________________ _______________________________________________
Quick Release Lever Lock used to retain the knife. Can be very difficult to adjust the MOLLE clips when fitted into the PALS webbing.
Slim and Versatile Blade. Handles as easily as flatware. No Belt Loop.
The Sheath fits Directly into PALS webbing loops. Black Blade finish can ‘drag’ when cutting.
Secure Grip provided by the finger groove and heavy jimping. Inserting the blade the wrong way round can blunt the blade.
Ambidextrous.

 

Discussing the Review:

The ideal place to discuss this reviews is on a forum. If you started reading the shorter forum version of the review, but followed the link this full exclusive review, please return to that forum to discuss the review there.
If you read the review entirely on Tactical Reviews, please consider one of the following to join in any discussion.

EdgeMatters – Sponsored Reviews (UK based Forum for Knife Makers and Collectors)

BladeForums – Knife Reviews (US based Forum for Knife Discussion)

CandlePowerForums – Knife Reviews Section (Largest and Friendliest Flashlight Community Forum)

Knife Review: Fällkniven F1 Pro

Although Fällkniven have a winning formula with their F1 Survival knife, (the official survival knife of Swedish Air Force pilots since 1995), Fällkniven’s desire for continual improvement led them to start work on the Pro Series, including the F1 Pro, in 2010.

 photo 34 F1 PRO with sheath P1170966.jpg
The Pro Series consists of the F1 Pro (featured here) as well as the S1 and A1 Pro models.

The Blade and Handle Geometry:

Most knife specifications have a basic description of the blade geometry, but in this section I will be taking a more detailed look at geometry and balance.

 photo 40 F1 PRO grind P1180553.jpg

Using a set of gauges and precision measuring equipment including a Vernier protractor, callipers, fixed radius gauges and the unique Arc Master adjustable radius gauge (the one that looks like a crossbow).
 photo Knife measuring P1180483.jpg

These measurements have been tabulated and are presented along with a few reference blades (8″ Chef’s Knife, 5.5″ Santoku and the popular Fällkniven F1).

Key aspects such as the primary bevel angle, grind type, blade depth, blade thickness, length, weight are detailed, along with balance information.
 photo 39 F1 PRO geometry P1180548.jpg

The ‘Balance relative to the front of the handle’ tells you if the knife will feel front heavy, or if the weight is in your hand (a positive value means the weight is forward of the front of the handle). The ‘Balance relative to the centre of the handle’ indicates how close to a ‘neutral balance’ the knife has in the hand.
 photo 38 F1 PRO balance P1180542.jpg

In the case of full convex grinds the approximate centre of the grind is used for the primary bevel angle estimate.

 photo F1 PRO parametersV2.jpg

The blade is made from laminated (Outer)420J2/(Centre)CoS (Cobalt-Special) steel.

Explained by the Maker:

The reasons for certain design choices may not be clear when simply looking at an object, so this section is intended to give an insight into the thinking behind a design by speaking to the designer themselves.

Unfortunately I can’t always get time with the designer so will use this section to include relevant information about the knife and its designer.

Peter Hjortberger (Founder of FÄLLKNIVEN AB) told me a little of the origin of the F1 – The F1 story started with an inquiry from two pilots in the Swedish Air Force (Swedish ”Flygvapnet”). They had a very, very simple sheath knife in their survival dress (leg pocket), a knife that cost less than one GBP. Considering that they were flying an air-fighter costing a huge amount of money, the pilots thought that they should carry a knife which was the same quality level as their aircraft.

Though there is quite a long story behind the F1 Pilot Survival knife, the ”F” comes from ”Flygvapnet”, but you can also consider it to be like the ‘F1’ of Formula One racing, or why not ‘F’ like in Fällkniven.

The F1 knife became such a worldwide success that Peter decided to stop selling products from other brands and concentrate the company on developing their own knives. From 1995 this has been the focus of the company and the reason behind Fällkniven’s good reputation all around the world.

Before getting into the detailed look at the F1 Pro, there is a list of upgraded features that Fällkniven have published so you can keep an eye out for them in the photos (especially the F1/F1 Pro comparison section). I’m going to quote the statement from Fällkniven and add some more detail as we go.

“1. The laminated VG10 steel is replaced with a laminate cobalt steel (lam. CoS) which, amongst other things, ensures a durable edge and improved edge retention.” – Uprating the steel has allowed the hardness to be increased from 59HRC to 60HRC without compromising durability. Cobalt is very beneficial in steel alloys and is used in drill bits suitable for drilling hardened steels. The composition of the CoS used by Fällkniven is shown below compared to the VG10.

Steel analysis
VG10
Composition
(59 HRC)
CoS
Composition
(60 HRC)
Cr – 15.00 Cr – 16
Co – 1.40 Co – 2.5
Mo – 1.05 Mo – 1.5
C – 1.00 C – 1.1
Si – 0.60 V – 0.3
Mn – 0.50 W – 0.3
V – 0.20 Si – trace
P – 0.030 P – trace

“2. The blades are consistently thicker causing an increased torsional rigidity – they will withstand even greater external forces than before.” – Currently unpublished, but Fällkniven have assured me that the breaking test result of the F1 Pro has provided a very positive result compared to the standard VG10 F1.

“3. The tapered tang is wider and thicker and thus significantly stronger.” – Though I’m not going to cut off the Thermorun handles to expose the tangs, when looking at the comparison photos of the pommel you can clearly see the thicker tang.

“4. The crossguard is made of stainless steel and permanently mounted to the tang.” – Though in real use, the F1’s finger guard has not let me down, the fact it is rubber has always concerned me slightly. The F1 Pro however now has a steel finger guard allowing you to much more confidently apply pressure to it.

“5. The convex edge has been refined to improve the cutting properties.” – The F1 I have actually appears to have a mostly flat grind with only the last 4-5mm convexed to the cutting edge. With the F1 Pro I can clearly see the edge is convexed through the entire primary grind to the edge.

“6. The zytel sheaths are redesigned meaning they are more durable and are better suited to the Molle attachment system.” – Without becoming too large, the F1 Pro sheath is far more robust and includes slots that can accommodate MOLLE straps.

“7. The knives are supplied with our most valued combination whetstone, the DC4. It offers both a diamond whetstone and a ceramic stone for field sharpening.” – Really this just makes the F1 Pro package complete, as you might already have a sharpening system. The DC4 however provides a combination diamond/ceramic stone in a pocket size package making it easy to carry into the field. Well worth having.

“8. The knives are packed in shock-resistant, waterproof boxes that can be used for storage of smart phones, GPS, documents, survival gear and much more.” – Packaging and presentation of the F1 Pro is excellent, and the case can be used for other purposes once you have stripped out the foam liner (easier said than donewith the one I had) giving you a tough case that is small enough to be packable and large enough to be useful.

Keep an eye out for these features in the following sections.

A few more details:

In keeping with Fällkniven’s normal product packaging the F1 Pro arrives in a white cardboard box.
I like the Swedish sense of humour as this is the first knife I have received which came with a supply of Fällkniven branded sticking plasters.
 photo 01 F1 PRO boxed P1170850.jpg

Inside the cardboard box is the tough, waterproof, plastic case.
 photo 02 F1 PRO case P1170858.jpg

Opening the case you find the contents nicely organised.
 photo 03 F1 PRO case open P1170861.jpg

The liner is a substantial closed-cell foam with finger cut-outs to make it easy to remove the items.
 photo 04 F1 PRO case insert P1170864.jpg

You have the F1 Pro knife, its sheath, the DC4 stone and a case for the DC4.
 photo 05 F1 PRO case contents P1170870.jpg

You can buy the DC4 separately, but in keeping with the uprated features of the F1 Pro you get this great stone with the F1 Pro. The gold side is the one with a diamond coating. With harder blade steels, the diamond makes it much easier to achieve a good result while not taking too long.
 photo 06 DC4 diamond P1170880.jpg

Flipping the DC4 over, it has a ceramic side which allows for a finer finish once the diamond side has done most of the work.
 photo 07 DC4 ceramic P1170881.jpg

As it comes out of the box, the sheath has the belt loop tucked into the top.
 photo 08 F1 PRO sheath tucked P1170884.jpg

Pulling out the belt loop and you can see the retaining strap as well.
 photo 09 F1 PRO sheath untucked P1170887.jpg

While looking at the sheath, let’s have a closer look as the new strapping points on side. This is the first one.
 photo 10 F1 PRO sheath MOLLE P1170889.jpg

On the other side, there is a cut-out in the middle of the strap loop which allows for the movement of the plastic sprung tab which holds onto the F1’s guard. When removing or inserting the F1 Pro, this tab moves far enough out that it would touch the strap loop if it did not have this cut-out.
 photo 11 F1 PRO sheath MOLLE P1170893.jpg

The webbing belt loop is riveted onto the back of the sheath.
 photo 12 F1 PRO sheath back P1170897.jpg

When sheathed, you can hold the sheath upside-down and even without the retaining strap done up, the knife doesn’t fall out, but for complete security the retaining strap is closed round the end of the handle.
 photo 13 F1 PRO sheathed P1170900.jpg

And now for the star of this review, the F1 Pro itself.
 photo 15 F1 PRO angle P1170909.jpg

Taking a close look at the tip of the blade. You can see the line where the outer and centre steels join.
 photo 16 F1 PRO blade tip P1170912.jpg

Looking closer still at the lamination join and cutting edge. Where the steels join it appears as if it is slightly softer as during the finishing processes the line has become slightly recessed. This is not a problem, just an observation.
 photo 35 F1 PRO lamination detail P1170975.jpg

Giving the edge a proper termination the F1 Pro has a choil centred on the plunge line.
 photo 18 F1 PRO choil P1170919.jpg

Often a point of weakness due to stress concentrators, the F1 Pro’s plunge line has a nicely radiused transition from primary grind to the ricasso.
 photo 19 F1 PRO plunge P1170922.jpg

The fit of the guard to the blade is excellent, but if looking closely at the grip to guard fit, the Thermorun handle material extends slightly beyond the guard.
 photo 20 F1 PRO guard P1170924.jpg

As with the F1, the tang of the F1 Pro is exposed at the pommel.
 photo 21 F1 PRO pommel P1170926.jpg

A flared tube is used for the lanyard hole and also secures the grip. The flaring of the tube not only keeps it in place, but also means the lanyard hole has no sharp edges that might have frayed the cord.
 photo 22 F1 PRO lanyard hole P1170929.jpg

The sides of the handle have a moulded diamond knurling pattern.
 photo 23 F1 PRO grip P1170932.jpg

Not actually sharp, the corners of the blade’s spine do strike sparks from ferrocerium rods.
 photo 25 F1 PRO spine P1170937.jpg

Comparing the F1 and F1 Pro:

This review is not simply a comparison of the F1 and this new F1 Pro, but it would not be complete without looking at the two side-by-side.

Starting with an overall view, the F1 Pro’s heavier build is immediately obvious. The new guard and modified blade grind really stand out.
 photo 26 F1 PRO compare angle P1170942.jpg

Staying with an overall view but this time directly side on. Overall dimensions are very similar.
 photo 27 F1 PRO compare straight P1170943.jpg

Focusing in on the handles, the F1 Pro has a slightly deeper grip with less pronounced palm swell.
 photo 28 F1 PRO compare handles P1170946.jpg

The new guard sits perpendicular to the edge. On the Original F1 the guard sweeps backwards.
 photo 29 F1 PRO compare guard P1170948.jpg

With a thicker blade stock and sabre grind, the blade of the F1 Pro is significantly stronger than the already strong F1.
 photo 30 F1 PRO compare blades P1170950.jpg

The exposed tangs also show the thicker blade stock used for the F1 Pro.
 photo 31 F1 PRO compare pommels P1170952.jpg

A view looking down onto the cutting edge of each knife to show the blade and handle thickness.
 photo 32 F1 PRO compare tickness P1170957.jpg

Lastly the F1 and F1 Pro sheaths side-by-side. The F1 Pro’s sheath is a bit chunkier than the F1’s.
 photo 33 F1 PRO compare sheathed P1170958.jpg

What it is like to use?

With the huge success of the F1, the ‘improved’ F1 Pro certainly has a lot to live up to. Initially I expected the F1 Pro to overshadow the F1 and make it virtually obsolete, but the reality is not so. Both knives have a place, and their differences are what would make you choose one over the other.

Picking up the F1 Pro, you can feel that it is nearly 20% heavier than the F1 though this is not a bad thing, just in keeping with its stronger build.

My hands take an XL size glove, so usually I prefer generously sized handles, especially if I’m going to work hard with it. That said, I’ve always appreciated the F1 being a relatively compact knife, and the F1 Pro still maintains this. A slightly larger grip fits in with this knife as an overall package very well. Even though the sheath has grown slightly as well, it still remains a lot of knife crammed into a small package.
 photo 37 F1 PRO in hand P1170992.jpg

Switching quickly to the hard case supplied with the F1 Pro. You can always leave the case as it came and put the F1 back into it, but once you have the F1 Pro out, you are not going to want to put it back into storage. I keep this one to hand, and it is very easy to pop into a backpack if getting into the great outdoors. So that case….what to do with it? Leaving the foam insert in it is no help as it will only accommodate the F1 Pro, so this needs to come out. With the case being listed as a reusable item, I was surprised that this foam did not want to come out. It seemed very firmly glued into place and I was about to give up when I found that the double-sided tape holding the foam layers together was partially out and sticking the foam to the side of the case as well. After much prying (this is a stiff closed-cell foam), I managed to get it free in one piece. The less patient might have used the F1 Pro to shred this foam liner. Of course, once out, the case can now be used for whatever you like.
 photo 41 F1 PRO case reuse P1180563.jpg

Time to get out into the field and try it out for various tasks. The first was a bit of wood carving. Not the only knife used for this, but one of the most comfortable thanks to the thick blade stock and the way the edges of the spine were finished. Placing your thumb onto the spine allows for power and control over the cut. After working with it in this way for quite some time, my thumb was not suffering at all and I could have carried on all day (but had other things to do).
 photo 34 spoon P1190553.jpg

As mentioned above, the spine was very comfortable to press onto, so I wondered how well it would strike a ferrocerium rod (really an essential for a survival knife). It turned out to be really rather good, giving a concentrated and directed shower of sparks.
 photo Fallkniven F1 Pro Ferro 600px 200ms Balanced.gif

I thought I would give it a try in the kitchen as well to see what its food preparation capabilities were. A blade this thick is always going to struggle a bit with deeper cuts and this test really showed this. Starting with mushrooms, the cuts were easy and controllable, but the slices were bent over and split by the thick blade.
 photo 50 F1 PRO kitchen P1220672.jpg

Moving to a thinner vegetable, it handled the mange-tout with ease and the baby sweetcorn were half cut, half split apart.
 photo 51 F1 PRO kitchen P1220679.jpg

The biggest challenge to the blade thickness was a crisp courgette. Cutting was easy but there was a great deal of splitting once the blade got a little deeper. Altogether though, the cutting was easy, and even if not my first choice for food preparation, the F1 Pro worked well enough.
 photo 53 F1 PRO kitchen P1220683.jpg

A little mention of that convex edge and maintaining it. For many, the maintenance of a convex edge is challenging. It is easy to set a knife at an angle and sharpen it, but the convex edge is a curve. This can be made even more difficult with an extended convexed edge, and in the case of the F1 Pro, the entire primary grind is convexed. To sharpen a convex edge you need to remove material over the entire convexed section, so for the F1 it means you really need to work on the entire primary grind. It will never look like new once you have done this. You can of course start to put a standard bevel onto the F1 Pro and it will still work well. I sometimes do this and once the bevel has got a little larger I just knock off the shoulder of the bezel (adding a second bevel) giving a pseudo convex effect. It is generally much easier to do this in the field than attempt a full convex sharpen.

Reader’s Note: There is a commonly known ‘simple’ convexing method using wet and dry paper and a mousemat, so you may want to look into this for maintenance at home. It is not really an ‘in the field’ method. Convexing by hand with a flat stone requires practice and a methodical approach, but can be done in the field with a small stone.

Is the F1 Pro going to be right for you? If you want a high strength, compact and efficient cutting tool, then the answer will be ‘yes’. You could also choose the tried and tested, proven design of the original F1, which gives you a slightly lighter and more compact overall package (at the cost of some blade strength), and this would be fine for most users and most conditions. ‘Most conditions’ being the crucial part of that description, as should you find yourself in an emergency situation where the knife might be tested to its limits, you might prefer to have all the strength you possibly could. The F1 Pro has that extra strength ‘in case’ you need it.

Taking the F1 Pro on its own merits, and you have an extremely sturdy, easily manageable cutting tool with excellent edge retention (thanks to the Cobalt Steel). The F1 Pro is a complete package with the knife/sheath, DC4 sharpener and reusable plastic case.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________ _______________________________________________
Things I like What doesn’t work so well for me
_______________________________________________ _______________________________________________
Builds on an already proven formula and reputation. Quality and strength comes at a higher price.
Cobalt steel edge. Relatively heavy for its size.
Very strong blade. Convex edge can be more difficult to maintain with standard whetstones.
Strikes a ferrocerium rod well. Thicker blade less suited to deeper cuts.
Thick spine is very comfortable to push with the thumb for heavy cuts.
Price also includes the DC4 sharpener and reusable waterproof case.

 

Discussing the Review:

Please feel free to add comments to the review, but the ideal place to freely discuss these reviews is on a forum. If you started reading the shorter forum version of the review, but followed the link this full exclusive review, please return to that forum to discuss the review there.
If you read the review entirely on Tactical Reviews, please consider one of the following to join in any discussion.

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Light Review: FOURSEVENS Preon P1 and P2

FOURSEVENS’ Preons have been very popular and well regarded AAA powered EDC lights. Being time for a reboot, here are the current updated versions of the Preon P1 and P2.

(And yes, they do have a high efficiency XP-L LED.)
 photo 09 Preon P2 angle LED P1160829.jpg

Taking a more detailed look:

Presentation is great with FOURSEVENS’ standard clear plastic box packaging.
 photo 01 Preon P1P2 boxed P1160796.jpg

Each Preon comes with one set of AAA Alkaline cells, two spare O-rings and the instructions.
 photo 02 Preon P1P2 unboxed P1160798.jpg

A quick look at the previous generation Preon P2 (in toxic green) with the latest generation Preon P1 and P2.
 photo 04 Preon P1P2 trio angle P1160808.jpg

A feature of the Preons is the metal switch button. Prior to anodising, this has been engraved with the FOURSEVENS logo.
 photo 05 Preon P2 switch engraving P1160815.jpg

The stainless steel pocket clip is a well finished and has a well-suited tension (not too stiff) to the size and weight.
 photo 06 Preon P2 clip P1160819.jpg

Just above the head of the light the FOURSEVENS logo is laser engraved through the anodising.
 photo 07 Preon P2 engraving P1160821.jpg

On the opposite side the model is engraved.
 photo 08 Preon P2 engraving2 P1160825.jpg

A view of the contacts inside the head. (This is the same for the P1 so the P1 is not being shown.)
 photo 10 Preon P2 head contact P1160831.jpg

The threads are a standard form, and are well lubricated. (This is the same for the P1 so the P1 is not being shown.)
 photo 11 Preon P2 threads P1160834.jpg

You can unscrew the switch cap and take the clip off, but this does not give access to the battery chamber.
 photo 12 Preon P2 switch cap off P1160837.jpg

An XP-L LED sits in a small textured reflector.
 photo 13 Preon P2 reflector P1160839.jpg

Looking straight into the small reflector.
 photo 14 Preon P2 LED P1160845.jpg

The clip on the P1 is the same, but here is a view from a different angle.
 photo 15 Preon P1 clip P1160848.jpg

The P1 also has a metal switch cap over a forward-clicky switch.
 photo 16 Preon P1 switch P1160854.jpg

The new Preons feature a fully textured body with grooves for grip along the entire length.
 photo 17 Preon P1 body P1160855.jpg

With it shorter battery tube it is just possible to show the positive contact spring terminal.
 photo 18 Preon P1 negative terminal P1160864.jpg

For scale, each Preon is shown with its AAA cells next to it.
 photo 19 Preon P1P2 size P1160870.jpg

The beam

Please be careful not to judge tint based on images you see on a computer screen. Unless properly calibrated, the screen itself will change the perceived tint.

The indoor beamshot is intended to give an idea of the beam shape/quality rather than tint. All beamshots are taken using daylight white balance. The woodwork (stairs and skirting) are painted Farrow & Ball “Off-White”, and the walls are a light sandy colour called ‘String’ again by Farrow & Ball. I don’t actually have a ‘white wall’ in the house to use for this, and the wife won’t have one!

For this set of beamshots, the exposure has been kept the same for the P1 and P2 to show their relative brightness.

Starting indoors with the P1, it has plenty of power for your close range EDC needs, with a nice wide, soft, hotspot and wide spill.
 photo 20 Preon P1 indoor beam P1170374.jpg

With the P2 it looks the same just brighter, as the P2 has double the output of the P1.
 photo 21 Preon P2 indoor beam P1170370.jpg

At outdoor ranges the Preons struggle as they are only AAA powered and have a flood orientated beam. These exposures are long to show anything. The P1 doesn’t have much impact.
 photo 22 Preon P1 outdoor beam P1170293.jpg

With the same exposure to allow direct comparison, the P2 looks a bit better, but this is a long exposure, so don’t expect too much at this range.
 photo 23 Preon P2 outdoor beam P1170285.jpg

Modes and User Interface:

Both the Preon P1 and P2 operate in the same way with a forward-clicky switch.
In total, there are 7 output modes which can be used – Low, Medium, High, Strobe, SOS, Beacon (high), Beacon (low).

To fine tune the Preon to your needs, you can set one of 5 possible ‘Configurations’ which have only certain modes available:
Configuration 1: High
Configuration 2: Previous, High, Low
Configuration 3: Previous, High, Strobe
Configuration 4: Previous, Low, Medium, High, Strobe
Configuration 5: Previous, Low, Medium, High, Strobe, SOS, Beacon (high), Beacon (low)

By default, configuration 2 is set. To change configuration, rapidly press the switch 10 times within 2s, holding or clicking the tenth press.
At this point the Preon will flash 1 to 5 times to indicate the selected configuration.
Quickly turn the Preon OFF and ON again to move to the next configuration, and repeat until you have the desired configuration. To memorise the setting, turn the Preon OFF for 5 seconds.

The Preon has a memory of the last mode used. This is relevant only on Configurations 2, 3, 4 and 5.
To change to the next mode in the chosen configuration, turn the Preon OFF and ON again within one second.
As shown in the Configuration list above, when you first turn the Preon ON, you get the ‘previously used’ output mode. When you then change mode, you jump to the start of the set of modes for that Configuration.
For example, if you are set to Configuration 5 and previously used Strobe, when you first turn the Preon ON you get Strobe, and when changing modes the next mode becomes Low, Medium… (In this example you do not go to SOS as the next mode).

Batteries and output:

The Preon P1 runs on 1x AAA and the P2 on 2x AAA; either Alkaline of NiMh cells can be used (maximum input voltage 3.0V).

To measure actual output, I built an integrating sphere. See here for more detail. The sensor registers visible light only (so Infra-Red and Ultra-Violet will not be measured).

Please note, all quoted lumen figures are from a DIY integrating sphere, and according to ANSI standards. Although every effort is made to give as accurate a result as possible, they should be taken as an estimate only. The results can be used to compare outputs in this review and others I have published.

___________________________________________ ________________________________ ________________________________
P1/P2 using AAA Eneloop I.S. measured ANSI output Lumens PWM frequency or Strobe frequency (Hz)
___________________________________________ ________________________________ ________________________________
P1 – High 127 1000
P1 – Medium 63 1000
P1 – Low 7 1000
P2 – High 259 950
P2 – Medium 137 950
P2 – Low 33 950

* Beacon and Strobe output measurements are only estimates as the brief flashes make it difficult to capture the actual output value.

Peak Beam intensity for the P1 measured 200 lx @1m giving a beam range of 28 m.
Peak Beam intensity for the P2 measured 600 lx @1m giving a beam range of 49 m.

There is no parasitic drain.

The two Preon models are also shown next to the Bolt-Mini, as this was another FOURSEVENS AAA light I have tested (check index page for this review). Thanks to its two AAA cells, the P2 is the only light to display full regulation in the output. With only one AAA, the P1 is always pushing this limited power source, but runs with a pretty consistent output after the initial drop from the 3 minute ‘burst’ at turn-on.
 photo Foursevens Bolt mini Preon P1 P2 runtime.jpg

Troubleshooting

This section is included to mention any minor niggles I come across during testing, in case the information helps anyone else.

No issues were encountered during testing.

As per the description of this section, this information is provided in case anyone else finds a similar ‘issue’ that might be fixed in the same way.

The Preon P1 and P2 in use

When compared to the previous generation Preons, these new versions are slightly chunkier, and initially I was not entirely convinced, as the point of an AAA light is to be very small. But then I remembered that as much as I love the older P2 shown in the photos, it was always a bit slippery. The smooth body wanting to slide around and not giving much of a grip.

With the new Preons having a grip pattern over the entire length of the light, no longer do you get this slippery feeling. One further observation though, is that these grooves tend to pick up pocket fluff nicely, which does somewhat spoil the look.

Personally I preferred the previous UI where it had no memory, but for some a memory is a requirement as you can pre-select the output you generally use. However, as the memory only affects the mode at switch-on, after which the mode selection goes to the first of the modes in the current Configuration, it only takes one mode change to return to Low (if Low was not the previously used mode). On the P2, the Low is much brighter than it used to be (3lm in the previous version) as it is now 33lm. The P1’s low is still pretty low at 7lm so if you need a lower output the P1 is the way to go.

Unfortunately another aspect has changed in the new version, PWM is rearing its head. The previous P2 had PWM but at 2500Hz and was not noticeable to the naked eye; the new version has PWM at 1000Hz. On High and Medium this has not really been visible, but on Low, I do catch the strobing effect out of the corner of my eye. A minor irritation and not what I would expect of FOURSEVENS. It slightly takes the edge off what could be a great update to this well loved series.

It used to be more common for smaller EDC lights to go with a reverse-clicky switch, but as in earlier versions, the Preon does use a forward-clicky and gives you that immediate response to pressure on the switch.

A great feature that has been added to the Preons is the user-changeable configuration that allows you to limit which output modes can be selected. You don’t get to choose which modes are included in a ‘configuration’ but you can choose one of the five available ‘configurations’ to best suit your needs. This user configuration has great potential and I hope FOURSEVENS expand the number of configurations that can be chosen from including a lower level in the P2, and perhaps configurations with no memory. Remember when choosing your configuration that the new Preon has a memory so starts on the last used mode.

With the small power source of AAA, the added efficiency of the XP-L (though only around 9%) makes a difference. Thanks to the XP-L having an XM-L2 size die in a smaller package, it is compact enough to be fitted into the Preon’s head and provide a great EDC beam.

The new Preon doesn’t just have a new body design, it has user-configuration and an XP-L LED.

Review Summary

_______________________________________________ _______________________________________________
Things I like What doesn’t work so well for me
_______________________________________________ _______________________________________________
XP-L LED in a truly pocket-sized light. PWM at 1000Hz giving some strobe effects on low.
New ‘grippy’ body design. P2’s lowest level is a bit high at 33lm.
User configurable.
Great EDC beam.

 

Discussing the Review:

Please feel free to add comments to the review, but the ideal place to freely discuss these reviews is on a forum. If you started reading the shorter forum version of the review, but followed the link this full exclusive review, please return to that forum to discuss the review there.
If you read the review entirely on Tactical Reviews, please consider one of the following to join in any discussion.

CandlePowerForums – Flashlight Reviews Section (Largest and Friendliest Flashlight Community Forum)

EdgeMatters – Sponsored Reviews (UK based Forum for Knife Makers and Collectors)