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Five-seveN
The FN Five-seveN USG with a Surefire light.
Type	Pistol
Place of origin	Belgium
Production history
Designed	2000
Manufacturer	FN Herstal
Produced	2000–present
Variants	See Variants
Specifications
Weight	USG: 617 g (1.36 lb) empty USG: 744 g (1.64 lb) loaded IOM: 590 g (1.3 lb) empty
Length	208 mm (8.2 in)
Barrel length	122 mm (4.8 in)
Width	USG: 39mm (1.88 in) IOM: 35 mm (1.4 in)
Height	USG: 137mm (5.4 in) IOM: 145 mm (5.7 in)
Cartridge	5.7 x 28 mm
Action	Delayed blowback
Rate of fire	Semi-automatic
Effective range	50 m (~55 yd)
Feed system	10 or 20-round detachable box magazine
Sights	"3-dot" type; square notch rear, vertical post front

The Five-seveN is a semi-automatic pistol manufactured by Fabrique Nationale de Herstal (FNH).

FN created the new 5.7 x 28 mm cartridge for its FN P90 personal defense weapon to meet NATO requirements released in 2000. Subsequently FN created the Five-seveN pistol to offer agencies who adopt the P90 a sidearm chambered for the same cartridge.

Contents 1 Overview 2 Variants 2.1 Five-seveN 2.2 Five-seveN Tactical 2.3 Five-seveN IOM 2.4 Five-seveN USG 3 Accessories 4 See also 5 External links 6 References

Conventional sidearms usually use the 9 x 19 mm, .45 ACP and similar cartridges that can neutralize a target in plain clothing. However, FN argues that these bullets can be defeated by a light Kevlar vest, such as those in use by more than half the world's armed forces and an increasing number of criminals. FN claims that their newly designed 5.7 x 28 mm cartridge allows the Five-seveN to pierce the older U.S. Army PASGT vest at 300 meters range, and a U.S. Army PASGT helmet at a range of 240 meters. However, these penetration statistics are for the military SS190 cartridge. Other available cartridge variants are not armor-piercing, according to the BATFE. These cartridges are loaded with heavier, expanding projectiles driven at lower velocities.

FN markets the 5.7 mm round as being able to penetrate and incapacitate an enemy, but there has been controversy over these claims. Conventional hollow point bullets rely on expansion to create a large wound channel, but the Five-seveN's ammunition is designed to hit, travel a few inches, then tumble end over end without deforming. This means that the wound it creates would be as tall as the length of the projectile (more than 21 mm), supposedly creating a more grievous wound channel, but without the expansion of a hollow point or the fragmentation of a frangible bullet. As a result, FN claims the round—and the Five-seveN—are suitable for military use.

The advantages of the pistol itself include its weight (the 5.7 mm round weighs half as much as a standard 9 mm round), its recoil (FN claims the 5.7 mm round produces roughly half the felt recoil of a 9 mm round), and its 20-round magazine, which holds significantly more ammunition than other pistols. Despite its magazine capacity, the Five-seveN is a light pistol, weighing 726 g (1.6 pounds) loaded. It is also reasonably compact.

Though an effective weapon, the Five-seveN has not been widely adopted, due mostly to the rather unconventional concept and ammunition. Current users include several international special forces/counter-terrorist groups (including the French GIGN) and a large number of local police department SWAT teams (including some in the United States).

The original Five-seveN is now discontinued. It has a double action (DA) trigger and no safety. This makes shooting slower and less accurate than with the newer single action variants of the Five-seveN. It features a shaped trigger guard, designed to facilitate gloved use.

This model is identical to the original version, with the exception of the single action (SA) trigger and a safety device. The Five-seveN Tactical is also increasingly hard to find.

The IOM model (for Individual Officer's Model) was the first publicly available variant, debuting commercially in 2004. The IOM is similar in its basic design to the original versions, but differs in that it has a different accessory rail, lined trigger guard outside edge, and adjustable sights. It also incorporates a magazine disconnect—this safety mechanism prevents the weapon from being fired without the magazine inserted.

The most recent version of the Five-seveN, the USG. (United States Government) variant debuted in 2005 and replaced the IOM. The USG keeps the differences incorporated in the IOM, such as the magazine disconnect and adjustable sights, but has further modifications, including: conventionally-shaped (square) trigger guard, checkered grip pattern, and a larger, reversible magazine release.

All models of the Five-seveN can also be mounted with a laser aiming module (LAM) or a tactical flashlight on the accessory rail. There are various companies that make these devices for various firearms.

A threaded barrel is available for mounting a suppressor. Again, various manufacturers provide their models and variations of suppressors.

FN produces night sights for the DAO and Tactical models. These sights do not fit the IOM and USG models without gunsmithing. Trijicon is slated to produce tritium night sights for the IOM and USG models, but they are not available yet. There are also other companies that produce sights for various pistols that may or may not require gunsmithing.

As with all pistols, holster options are limited only to the choice that the individual or department makes. There are myriad options one can take when deciding on a holster for their sidearm.

A magazine extension for the Five-seveN is available that will extend 1.75 inches below the weapon. It allows the Five-seveN to hold ten extra rounds, for a total of thirty.

• FN P90
• 5.7 x 28 mm
• List of pistols
• HK UCP

• FN USA Official page
• Guns & Ammo Five-seveN Article October 2006
• American Handgunner Five-seveN/P90 Article
• Modern Firearms — Five-seveN