P90

The FN P90, also known as the FN Project 1990 PDWS, is a compact submachine gun designed and manufactured by FN Herstal in Belgium. Created in response to NATO requests for a replacement for 9×19mm Parabellum firearms, the P90 was designed as a compact but powerful firearm for vehicle crews, operators of crew-served weapons, support personnel, special forces, and counter-terrorist groups. It is often referred to as a compact personal defense weapon.

Designed in conjunction with the FN Five-seven pistol and FN 5.7x28mm NATO ammunition, development of the weapon began in 1986, and production commenced in 1990 (from which the "90" in its name is derived), whereupon the 5.7×28mm ammunition was redesigned and shortened. A modified version of the P90 with a magazine adapted to use the new ammunition was introduced in 1993, and the Five-seven pistol was subsequently introduced as a companion weapon using the same 5.7×28mm ammunition.

Featuring a compact bullpup design with an integrated reflex sight and fully ambidextrous controls, the P90 is an unconventional weapon with a futuristic appearance. Its design incorporates several innovations such as a unique top-mounted magazine and FN's small-caliber, high-velocity 5.7×28mm ammunition. Additional integrated features include interchangeable visible or infrared laser and tritium light source.

In-game version uses 5,7mm bullets and is an best SMG in game. You can loot P90 from air drops.