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 The FN P90 is a Belgian-designed personal defense weapon (PDW). The weapon's name is an abbreviation of Project 90, which specifies a weapon system of the 1990s. The P90 was originally designed as a compact but powerful firearm for vehicle drivers, operators of crew-served weapons, support personnel, special forces and anti-terrorist units. Developed between 1986–1987 by FN Herstal, the P90 features a compact bullpup design, ambidextrous grip and a polymer and alloy-based construction. The weapon contains several innovative features including the top-mounted magazine and proprietary 5.7x28mm ammunition, designed for greater penetration of body armour than conventional pistol ammunition. The P90 was developed between 1986 and 1987 in Herstal, Belgium. Its goal was to replace the pistol-caliber submachine guns which were in use at the time by military and law enforcement personnel, as it had become evident that such weapons were ineffective against body armour. The P90 is a selective fire straight blowback-operated weapon with a short recoiling barrel and fires from a closed bolt. The return mechanism consists of two parallel spring guide rods that also guide the bolt carrier assembly. The weapon uses an internal hammer striking mechanism and a trigger mechanism with a three-position rotary dial fire control selector, located centrally beneath the trigger. The fire selector also provides a manual safety against accidental firing. The dial in the "S" position – weapon safe, "1" – semi-automatic fire, "A" – fully automatic fire. When set on "A", the selector provides a two-stage trigger operation. Pulling the trigger back slightly produces semi-automatic fire and pulling the trigger fully to the rear will produce fully automatic fire. The "safe" setting disables the trigger. The P90 is fully ambidextrous; it can be operated by right or left-handed shooters without making any modifications to the weapon. The charging handle, auxiliary fixed sights and magazine release are symmetrically distributed on both sides of the firearm. The manual fire selector below the trigger can be operated from either side. Spent cartridge casings are ejected downward through a chute located aft of the pistol grip, keeping fired cases out of the shooter's line of sight. The P90 was originally equipped with an unmagnified HC-14-62 reflex sight from Ring Sights, which enabled quick target acquisition up to 150 metres (490 ft) and operation in low-level lighting conditions thanks to a tritium-illuminated aiming reticle. Newer guns are fitted with the Ring Sights MC-10-80 sight designed specifically for the P90. It uses a forward-aimed fiber optic collector to illuminate the daytime reticle, which consists of a large circle of about 180 Minute of arc (MOA), with a 20 MOA circle surrounding a dot in the center. The night reticle consists of an open "T" that is primarily illuminated by a tritium module or moonlight and ambient light drawn in by an upward-facing collector. The sight is adjustable for both windage and elevation and can be used with night vision equipment. Auxiliary fixed iron sights are provided on both sides of the receiver's cast aluminium optical sight housing.  | |
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