Personal Defense Weapon FN P90

Caliber: 5.7x28mm SS190
Weight: 2.54 kg empty; 3 kg loaded with magazine with 50 rounds
Length: 500 mm
Barrel length: 263 mm
Rate of fire: 900 rounds per minute
Magazine capacity: 50 rounds{with extended mags, 75 rounds}
Effective range: 200 meters

The P90 is a selective fire straight blowback-operated weapon, that fires from a closed bolt. The return mechanism consists of two parallel spring guide rods that also guide the bolt carrier assembly. The weapon's 263-mm hammer-forged steel barrel is fitted with a ported, diagonally cut flash suppressor that also acts as a recoil compensator.
The P90 is designed in the bullpup configuration, in that the action and magazine are located behind the trigger and alongside the shooter's face. This reduces the firearm's overall length, because there is no wasted space in the buttstock as in conventional designs. The P90 is fully ambidextrous—it can be operated by right or left-handed shooters with equal ease, and 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 pistol grip has a thumbhole and oversized trigger guard that acts as the forward grip, and a protrusion is incorporated into the front of the weapon's stock to prevent the user from accidentally reaching out in front of the muzzle during firing.The P90 is a modular firearm and consists of 69 parts that disassemble into four main groups: the barrel with integrated sight assembly, the receiver with return mechanism, the stock body with trigger and firing mechanism, and the magazine. The weapon's design makes extensive use of polymers and lightweight alloys to reduce both the weight and the cost of the weapon.
The P90 uses an internal hammer striking mechanism and a trigger mechanism with a three-position rotary dial fire control selector, located at the foot of the trigger. The fire selector also provides a manual safety against accidental firing. The dial has three settings:
"S" – safe, "1" – semi-automatic fire,and "A" – fully automatic fire.
When set on "A", the selector provides a two-stage trigger operation similar to that of the Steyr AUG. Pulling the trigger back slightly produces semi-automatic fire and pulling the trigger fully to the rear produces fully automatic fire. The "safe" setting disables the trigger.