FIELD PISTOL®

The System

The 7.5 FK Field Pistol concept is based on the following general criteria :

A double stack magazine fed automatic pistol, with general dimensions and weight similar to current standard issue military pistols

Proprietary cartridge and projectile having a proven effective range in terms of accuracy and terminal ballistics of at least 100 meters (110 yards) against targets that weight up to 150 kg (330 lbs) while maintaining low recoil and controllability.

Single hand use ability.

Rapid acquisition sight system that does not require adjustment within the range spectrum.

THE CARTRIDGE

DESCRIPTION

The 7.5 FK® is a completely new proprietary cartridge caliber. The case is 27 mm long with a total length of 35 mm, and a head diameter of 10.8 mm. This caliber is not a necked-down version of any other caliber. The case is designed to withstand higher pressures than usually used in pistol calibers.

This cartridge will not fit in any other manufacturer's magazine, nor will it function in any other current production model pistol.

Muzzle velocity:	610 m/s (2000 fps)
Velocity at 100 m (110 yds):	465 m/s (1525 fps)
Muzzle energy:	1200 J (880 ft/lbs)
Energy at 100 m (110yds):	700 J (520 ft/lbs)
Bullets weights:	Monolithic HP and JHP bullets: 95gr Monolithic flat nose bullets: 101gr
Dimensions
Case length:	27 mm
Total length:	35 mm
Head diameter:	10.8 mm

CURRENT STATUS AND USE

The 7.5 FK® is C.I.P (Permanent International Commission) registered and approved. It is a proprietary cartridge caliber, with intellectual property rights claimed and registered by FK BRNO®.

The main use of the caliber is for long-range pistol target sports, medium (and dangerous) game hunting, home and personal defense and law enforcement, in addition to PSD's personal security detail, urban / suburban combat, backup (SBR) short barrel rifle, Aircrew survival weapon, mechanised armour crew weapon, among other uses..

DEVELOPMENT

Although the basic case design and the concept of the cartridge was finalized in 2011, more than 250,000 rounds were fired with at least 15 different case design variations and over 30 different bullet designs were tested over a four-year period before the final cartridge design form was approved for production.

HISTORY

The 7.5 FK® was initially developed to fulfill a requirement for a new cartridge, by a private customer in 2010. That requirement was addressing the shortfall of hand held and shorter/smaller firearms that were used in their relevant theater of action and bridged the gap between standard/popular pistol caliber and rifle calibers.

This requirement was subsequently canceled however the initial tests showed a very high accuracy potential which prompted the developers to continue with the cartridge as a target and long range pistol competition round, in addition to the original intended use.

The main design parameters were as follows:

Cartridge must be short and small enough to be used comfortably in magazine fed / in grip magazine, size of firearm.

Ballistics must be designed for a max barrel length of 150 mm, and projectile must be supersonic at 150 meters.

Recoil force should not exceed power factor 230, [ .45 ACP +P ]

Accuracy/ precision at 100 meters must be less than 100x100 mm rectangle.

Projectile must create hydrodynamic shock at impact range of 100 meter (110 yard) in targets with a weight of up to 150Kg (330 lbs).

Projectile permanent wound cavity in ballistic gel at 150 meters must be minimum 35 mm diameter and 300 mm in length.

THE PISTOL

DESCRIPTION

The 7.5 FK Field Pistol® is a single action, tilting barrel type mechanism, with a proprietary recoil attenuating system. This is not a modified design of another product or pistol model. This is a completely new and unique concept and design and the intellectual rights to the system have been registered and claimed by FK BRNO®. The design is very ergonomic and even though the magazine holds 15 - 35 mm long rounds, the smallest hands are able to fully wrap around the optimally angled grip of the pistol. The frame and slide are very slender and streamlined for such a size cartridge and caliber.

The pistol is made entirely by machining using an array of specialty high strength alloys and multiple controlled heat treatment methods and processes that are usually used on very large caliber high pressure firearms, such as field howitzers and auto cannons. It is produced to the highest standards in the industry.

SPECIFICATION

Length:	240 mm (9.5")
Width:	25.5 mm (1")
Height:	136 mm without sight (5.3") 143 mm with Butterfly Sight (5.6")
Weight:	1300 g (46 oz)
Magazine capacity:	15 +1
Finnish/color:	Nitridation / Dark Gray
Finnish/color life:	30+ hours salt spray bath
Action:	Single action
Barrel length:	152 mm (6")
Match use-barrel life:	20,000 rounds
Normal use-barrel life:	30,000 rounds
Grip material:	Aluminum Wood Plastic G10
Grip design:	Rounded and squared back versions
Sights:	FK BRNO Butterfly Sight® Three-Point Target Sight is adjustable for windage and the front sight is pre adjusted for elevation
Accuracy:	Guaranteed to shoot less than 100x100 mm rectangle at 100m

CURRENT STATUS AND USE

The Field Pistol® is a sporting pistol designed primarily to be used in long-range competitions, silhouette shooting, hunting, and generally any pistol shooting activity and tasks that requires the ability to engage targets at longer ranges, especially with a folding stock , such as (PSD) personal security detail, urban / suburban combat, backup (SBR) short barrel rifle, Air crew survival weapon, mechanised armour crew weapon, among other uses.

The pistol comes in two models: The Standard Field Pistol® and the Combat sport. Internally they are the same yet the Combat Sport is slightly more compact with less protruding edges for ease of use with competition holsters and clothing.

DEVELOPMENT

The Field Pistol® was designed entirely and exclusively around the 7.5 FK® cartridge, and to fulfill the original requirements for that cartridge: low recoil, controlled muzzle jump, useable with one hand accurately, and small enough and light enough to be concealable if required including the ability to carry in shoulder holster, the ability to use quick attach / detach compact foldable shoulder stock, without effecting the loading and ejecting of the magazine. Most importantly it had to be able to accurately shoot the cartridge with the goal being less than 100x100 mm at 100 meters. The Field Pistol® meets and exceeds all of these requirements.

HISTORY

The current design was not the preferred design at first. As a matter of fact FK BRNO® designed and built more than 40 prototypes using different mechanisms starting with roller locks both external and internal, gas recoil system, delayed blowback gas recoil system, rotating barrel lock and three different types and tilting barrel lock systems, before deciding to go with the current production model. There were advantages and disadvantages to all the designs, however the current model gave the cartridge the best possible platform for the intended use.

The Brace

Brace is designed exclusively for the 7.5 FK Field Pistol®, the ergonomic design is proprietary and unique to FK BRNO. It is a quick attach/quick detach design requiring no fitting, screws, or latches. The pistol can be fired when the brace is either in the open or closed position. The magazine can be changed without detaching the chest brace. It comes in one universal size.

Open length:	355 mm (14")
Folded length:	200 mm (7,9")
Weight:	350 g (12.3 oz)
Width:	40 mm (1.57")
Material:	High tensile steel alloy
Surface finish:	Nitridation / Dark Gray

* Not intended to be shouldered.

THE SIGHTS

The Field Pistol® comes with three different types of dovetailed sights:

THE BUTTERFLY SIGHT

This sight is a proprietary FK BRNO® design. It is designed to give the shooter a larger view of the target area and to automatically align with the front sight. This sight is very effective for long range target shooting and hunting.

The main sight is adjustable for windage and the front sight is pre adjusted for elevation.