FK BRNO Field Pistol: The Most Powerful Double-Stack Handgun In the World

Gun News

a picture of the FK Field Pistol with bullets

I have a long history with the FK BRNO Field Pistol. I remember I was around 10 years old when I first got to hold a wheelgun. Then, I had to sneak into my parents’ bedroom because my father wouldn’t let me near his S&W 686.

Back then I knew absolutely nothing about revolvers. The only thing I knew was it was the same gun Dirty Harry used.

“But being this is a .44 Magnum, the most powerful handgun in the world and would blow your head clean off, you’ve gotta ask yourself one question: “Do I feel lucky?” Well, do ya, punk?”

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What is the Most Powerful Handgun in the World?

The movie’s research team obviously didn’t do their homework — if they’ve read the Guns&Ammo magazine issue released some time in 1959 they would have known that Freedom Arms’ Model 83 single-action chambered for .454 Casull was the most powerful handgun in the world back in those days.

But this article isn’t about the .454 Casull, nor is it about the .44 Magnum (though we’ll talk about the latter a lot).

The .44 Magnum’s status was propelled to stellar heights because of Dirty Harry. At one point Smith and Wesson couldn’t keep up with demand for their Model 29s that they had to put a high premium for each of those mighty fine revolvers.

And semi-auto handgun aficionados have been putting effort to developing rounds that would mimic the performance of the .44 Magnum cartridge, one such glaring example of a cartridge being the .460 Rowland, a 45-caliber bullet with the weight, velocity and muzzle energy of the .44 Magnum that can be shot in a semi-auto package.

But the .460 Rowland came out almost two decades ago. There’s a new kid on the semi-auto block.

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The 7.5mm FK 

a picture of 7.5mm FK Cartridges

The most recent handgun cartridge that attempts to replicate .44 Magnum ballistics in a semi-auto handgun is the 7.5mm FK. The round was developed by an ammunition company based in Brno, the second largest city in the Czech Republic known for having a long history of firearms production.

The company, FK BRNO, set out to develop a handgun cartridge that would meet an important client’s demand with the following criteria:

  • Its overall length must be small enough such that it can be loaded and shot in a standard civilian size and weight double-stack magazine-fed pistol;
  • A barrel length of 5.9 inches (150 mm) must be enough room for the powder charge to propel the bullet to its maximum potential velocity;
  • Recoil energy should not exceed that of a hot .45 ACP +P load.
  • The bullet should have enough speed to consistently hit a 100×100 mm ( target at 100 meters.
  • The bullet’s terminal performance at 100 meters must be enough to take down a 330-lb. living target utilizing hydrostatic shock;
  • The target’s permanent wound cavity should measure a minimum of 35mm in diameter (roughly 1.38 inches wide) and 300mm in length (roughly 11.81 inches long);

7.5mm FK Specs

a picture of 7.5mm FK cartridge specs

The cartridge has an overall length of 35 mm from the base to the bullet nose, with the bullet firmly seated in a 27 mm-tall, 10.8 mm-wide brass case necked down to accept a smaller bullet.

The low-drag, hyper-velocity bullet is machined from solid copper and measures 7.5 mm in diameter or 0.295 inches, essentially making it a 30-caliber projectile. It weighs ~95 grains and has an advertised velocity of 2,000 feet per second, giving it a kinetic energy of 880 ft.lbf at the muzzle.

a picture of 7.5mm FK cartridges and bullets

Being made of solid copper and copper alloy, at 95 grains the bullet is longer, giving it a relatively high ballistic coefficient which results in superb long range terminal performance. At 100 meters, it carries a kinetic energy of 520 ft.lbf, which compares favorably to a .45 ACP’s kinetic energy of 414 ft.lbf. at the muzzle.

This means getting hit by one these speed demon bullets at 100 meters away will hurt more than getting hit by a 45-caliber bullet fired from the 5-inch barrel of a full size 1911 at point blank range.

People who have already shot this cartridge claim that its recoil is similar to a .40 S&W fired from a Glock 23. I’d do some recoil velocity and recoil energy calculations myself if powder load data for the 7.5 mm FK was available but I’m unable to find  info online at the time of this article’s writing.

a picture of a Boar killed with an FK Field Pistol

Available bullet designs are “banded” hollow point frangible nose (bullet has three cannelure), standard hollow point frangible nose, and spoon tips. These run the gamut from long-range target shooting, personal and home defense to hunting medium (up to deer-size) game at 100 meters.

The FK Field Pistol

Of course, there’s little point in developing such a powerful cartridge if it wouldn’t chamber in any firearm, which is why FK BRNO designed and developed the pistol concurrently with the cartridge.

The FK Field Pistol was only released recently.

It bears a striking resemblance to a relatively more common utilitarian semi-auto pistol from the Czech Republic, the CZ-75 manufactured by the company Česká zbrojovka Uherský Brod well known among enthusiasts.

a picture of the FK Field Pistol's Dust Cover

The only difference between the two pistols as far as appearance is the full length-dust cover. The FK Field Pistol has a noticeably wider and heavier dust cover which makes room for what the company claims is a proprietary recoil attenuating system, while the CZ-75’s dust cover closely resembles that of the legendary Browning Hi-Power chambered in 9x19mm Parabellum.

FK BRNO Field Pistol Weight

The FK Field Pistol weighs in at 46 oz. Its heft, especially when compared to a Glock 23, surely soaks up most of the recoil.

a picture of the FK Field Pistol's Recoil Spring

Unlike most modern pistols that have a captive recoil spring assembly, the FK Field Pistol uses a non-captive recoil spring similar but relatively larger than that of a standard 1911’s spring. It also uses what looks like a heavy and over-sized recoil spring plug that seems to act as a counterweight to redirect some of the recoil forces downward. This is the other reason why even with .44 Magnum power, the handgun only recoils like a Glock 23.

FK BRNO Field Pistol Barrel

a picture of the FK Field Pistol's Muzzle

The barrel measures an even 6 inches in length. Nothing fancy about it, unlike some of the barrels on high-end custom 1911s that have a 45-degree muzzle crown. But it looks like a bull barrel design which makes it relatively heavier than standard barrels. It is rated to withstand up to 30,000 rounds with normal use and only up to 20,000 rounds for match use.

The slide has front and rear diagonal serrations, pretty standard in semi-auto handguns, but it also has its front part “melted” or shaved off to reduce unnecessary weight. A heavy slide on any semi-auto handgun will require a heavy-recoiling round to eject the empty brass and a heavy recoil spring to complete its cycle (and to reduce wear on the frame from the breech face being pummeled by the recoil).


Another feature of the handgun that makes it unique is it comes installed with a patented “Butterfly” rear sight that has a ghost ring. This works well for long range, take-your-time recreational shooting (and maybe long-range medium game hunting), guaranteed to shoot tight groups within a target at 100 meters.

But this special rear sight wouldn’t do so well in CQB or other personal and home defense scenarios where faster target acquisition is required. For those purposes, the standard Novak-style rear sight that also comes with the handgun is the better option and can be easily installed on the dovetail-cut slide’s rear. It can only be adjusted for windage.

a picture of the FK Field Pistol's Front and Rear Sights

The front sight has a red fiber optic insert and comes pre-adjusted out of the factory for elevation. Because of the almost 10-inch sight radius, when aligning the sights, the red dot gets really tiny while the ghost ring on the Butterfly rear sight becomes blurry, giving a clearer sight picture which results in a more accurate shot.

Being a single-action-only type pistol (pulling the trigger only releases the hammer), the FK Field Pistol’s frame has a slide stop lever and manual safety lever. Polymer handgun lovers will probably hate those controls, but all-steel 1911 or Browning Hi-Power purists will love them.

Also because of being single-action only, the trigger pull weight is around 4.5 lbs. and breaks smoothly. It has zero creep.

FK BRNO Field Pistol – Grip

In addition, the FK Field Pistol has a beavertail grip, a proven grip design that eliminates hammer bites when shooting single-action only pistols with an exposed hammer. And the hammer on the pistol looks like the typical combat-style hammer for modern 1911-style or Browning Hi-Power handguns.

a picture of the FK Field Pistol's Wood Grips

The grip is only 1-inch wide, making this handgun surprisingly thin for what is supposedly a wide-body frame build, which is typical of all semi-auto handguns that accept staggered-column magazines (i.e. double stack magazines).

From the base of the inserted magazine to the top of the Butterfly sight, the handgun measures 5.6 inches in height. The height measures only 5.4 inches if the Butterfly sight is removed and the standard Novak-style rear sight is installed.

Speaking of magazines, a brand new FK Field Pistol comes with two in the box, each magazine can fit 16 7.5mm FK cartridge.

The FK Field Pistol’s frame dimensions make for a solid purchase on the grip, which shouldn’t come as a surprise considering the fine engineering and craftsmanship behind the handgun’s development and construction.

Grip designs come in anodized aluminum, wood, plastic and G10 — an extremely strong fiber glass material made of epoxy laminate. I think the wood grips are the best looking option for this handgun. There is nothing more aesthetically pleasing than the look of a polished blued handgun fitted with wood grips.

7.5mm FK vs. Other Handgun Calibers

Sure, the 7.5mm FK bullet has been proven to penetrate over 50 cm (19.68 inches) of ballistics gelatin with bone and denim simulants and four layers of denim.

a picture of the 7.5mm FK bullet penetrating ballistics gel

But being the numbers guy that I am and with no other sources of comparison data available anywhere at the moment, I decided to crunch some numbers to get a better idea how the 7.5mm FK compares to other more common handgun calibers on the US market.

Here’s a table that has all the necessary data to compare the 7.5mm FK with 14 of the more powerful handgun cartridges commercially available. Seven of these are for semi-auto handguns and the remaining seven are for revolvers.

a picture of a table with handgun caliber specs to compare 7.5 FK cartridge ballistics with others

To make sense of all the data on the table, I created a few graphs, just the way I did it when I compared 52 of the most common US handgun cartridges in a recent article:


a picture of a graph with velocity data

The velocity chart shows that the 95-grain 7.5mm FK bullet (green bar) at 2,000 feet per second is around 24.37% faster than the fastest .44 Magnum load on the market which uses a 180-grain .429-inch bullet.

The 7.5mm FK bullet is also 25% faster than the hottest .44 Magnum load which uses a heavy 250-grain bullet that can be propelled from a 6-inch magnum revolver at speeds of around 1,550 feet per second.

What this means is the 7.5mm FK will have a significantly flatter trajectory compared to any .44 Magnum loads on the market today. It will be more accurate at longer distances.

The only cartridge that beats it in the velocity department is the .22 TCM, another fairly recent cartridge design that uses a lightweight 40-grain bullet measuring .224 inches in diameter that can fly out of a 5-inch-barrel 1911-style handgun at 2,777 feet per second. Whoever said the 7.5mm FK is the fastest semi-auto handgun cartridge in the world is dead wrong.

Muzzle Energy

a picture of a graph with muzzle energy data

As far as muzzle energy, the .44 Magnum in this boxing weight class is the undisputed champion.

Yes, they do move slower than the 7.5mm FK bullet, but these are wider and heavier bullets. The hottest .44 Magnum load with a 250-grain bullet moving at 1,550 feet per second has a muzzle energy of 1,333 ft.lbf, which means it’ll deliver around 58% more oomph than the 7.5mm FK when comparing point-blank shots.

Even the El Cheapo watered-down .44 Magnum load that uses a 180-grain bullet with velocities of up to 1,610 feet per second will have a muzzle energy of 1,036 ft.lbf when shot from a 6-inch barrel. This makes light .44 Magnum loads 22.75% more powerful than the 7.5mm FK, again when comparing point blank shots.


Ammo is reportedly selling for $50 per box of 50 rounds. We found some at Palmetto State Armory.

7.5mm FK Ammo for Sale

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All copper, monolithic nose discarding hollow point. The nose is designed to break off on impact, leaving a jagged 7mm meplat to create a large deep penetrating wound channel and a High Terminal Effect. Accurate and effective for defence and medium game hunting up to 200 lbs to 100 yards.

a picture of a graph with 7.5mm FK per-round price compared to other handgun cartridges

As the graph shows, the light .44 Magnum load having 22.75% more muzzle energy is 20% cheaper than the 7.5mm FK at just $0.80 per round. But it compares rather favorably with all the other handgun cartridges within its muzzle energy class.

And take note, the 7.5mm FK cartridge uses precision-machined solid copper bullets. This makes the chart skewed, because while all the other cartridges on the chart use jacketed hollow point bullets with a lead core (which are relatively cheaper), the 7.5mm FK only uses solid copper.

How much does the FK BRNO Field Pistol cost?

Now comes the bitter pill to swallow.

To get the exact price for the FK Field Pistol, I went to the manufacturer’s website and found two distributors in the US: Luxury Firearms, LLC in Oklahoma, and Bullseye Guns in Florida.

I sent an email to both companies. So far I have yet to get a reply from Bullseye Guns, but the CEO of Luxury Firearms, Tony Mussatto, replied to me promptly to set up a phone call with his assistant. A few days after, we talked over the phone about pricing and some of the company’s future plans for distributing the pistols and cartridges.

It was then I found out that the FK BRNO Field Pistol was selling for a jaw-dropping $7,500.

Since then I found variations on

FK BRNO Field Pistol


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Even considering the uber-high costs of years of R&D to come up with a new design, setting up the required tools and machinery, manufacturing, the product’s value proposition, and even the novelty that comes with it and/or whatever else I might have overlooked, I wouldn’t personally buy this pistol — then again it would be because I’m a cheapskate.

Other Miscellaneous FK BRNO Field Pistol Info

While talking to Tony, I asked a few other questions which I know a lot of other handgun enthusiasts are asking:

Q: The online consensus among firearms enthusiasts is the FK Field Pistol is a fantastic piece of hardware, all things considered. However most people don’t think they’d want one because of the price. I read that article from which says, and I quote, “FK BRNO is very clear that they are not building a gun for the masses, nor are they open to outside theories in this area.” But the article was written February of this year. Are there really no plans to mass-produce these pistols in the foreseeable future?
A: No. There are only 1,001 of these handguns made for the US. After 1,001, we’ll go to a different model.

Q: Will that model also chamber the same 7.5mm FK rounds?
A: Yes, it will. It’ll be a combat version.

Q: Would that happen to be the shorter version with a 5-inch-barrel that I saw on the manufacturer’s website?
A: Yes.

Q: How much would that cost?
A: That’s too far out right now.

Q: I can’t help but compare the 7.5mm cartridge to another proprietary cartridge that came out fairly recently, the .22 TCM. Rock Island Armory now has rifles built to chamber the .22 TCM. I think the 30-caliber FK round is way up there on the kinetic energy scale. Do you know if FK has any plans of building rifles or carbines or any other types of firearm that chambers their cartridge as well?
A: Not at this time.

Q: Further on the cartridge, I noticed that all three load variants use solid copper. Does the company have plans to manufacture bullets with a lead core? Like a standard FMJ or a JHP with lead core? Because I think lead bullets being cheaper, it’ll encourage handloaders to buy the handgun and reload their own ammo.
A: No, not at this time.

Q: Is it a limitation of the pistol that it can only use solid copper bullets?
A: No comment on that one. I don’t know exactly.

Q: On a YouTube video uploaded by a user named TFB TV, he said they were unable to fit 16 rounds in either of the two magazines that came with his review sample. Could there be potential issues with the magazines or are they just doing things wrong?
A: The review sample’s magazine had extra strong springs. It won’t be an issue with commercial versions of the magazines. Those will use different springs and will fit the full capacity of 16 rounds.

Q: You said there are only 1,001 of the 6-inch FK Field Pistol made for the US. Will there also be a limited number of the 5-inch-barrel combat models you mentioned? And when will those be released?
A: I can’t say anything on that right now.

FK BRNO Field Pistol – Conclusion

To say the FK Field Pistol is a masterpiece is an understatement.

Sure, full-power .44 Magnum loads are still more powerful than the cartridge it uses. And lighter .44 Magnum loads are also cheaper round-per-round.

But consider these six reasons why you should get an FK Field Pistol if your budget allows it:

  • Ammo Capacity:The .44 Magnum revolver typically only holds six rounds versus the FK Field Pistol’s magazine that holds 16. You can shoot more before you have to reload.
  • Speed of reloading:Reloading a six shooter with another six rounds is too slow compared to reloading the FK Field Pistol with another 16 rounds. You can shoot more bullets faster with the semi-auto.
  • Ease of concealed carrying:The .44 Magnum revolver by virtue of having a cylinder is bulky and not ideal for concealed carry. The FK Field Pistol being a semi-auto and having a narrower frame with no cylinder will be easier to carry concealed.
  • Ease of holster carrying:

The typical 6-inch-barrel .44 Magnum revolver has an overall length of around 12-inches, while the FK Field Pistol’s overall length is only 10 inches. Holster carry wouldn’t be too much of a problem with the FK Field Pistol (it even comes with a holster out of the box).

  • Accuracy:Most big-bore revolvers only come with standard adjustable iron front and rear sights. The FK Field Pistol comes with two types of interchangeable rear sights, one is for long range shooting and the other is for personal defense.
  • Intended Purpose:Typically, .44 Magnum revolvers are only used for hunting medium to large game (and maybe for home defense or as a truck gun). The FK Field Pistol can be used for a lot of other things: competition, hunting medium game, home defense and concealed carrying for CQB scenarios.

If I had several thousand to spare, I wouldn’t hesitate to get me one of these fine pistols. Then again that’d be a big “IF”.

I think FK BRNO should be keen on establishing these new handguns as the next semi-auto norm. It’s always possible to find ways of driving production expenses down. If they’ll sell the combat version of these 7.5mm FK pistols cheaper, I’m all in.

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Chris Browning

Hey everyone I’m Chris. Founder and editor at Gun News Daily. This site was originally started by my father who passed it on to me. Gun News Daily has been reporting on gun news and conservative politics since 2001. We are the original gun news source. Life-long Second Amendment Supporter.

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