The FN P90 is a compact, lightweight submachine gun designed by the Belgian company FN Herstal. It features a unique bullpup configuration, which means the action and magazine are located behind the trigger, allowing for a shorter overall length without sacrificing barrel length. The P90 is chambered for the 5.7×28mm cartridge, providing low recoil and high velocity. The P90 is known for its distinctive top-mounted magazine that holds 50 rounds, enabling sustained fire without frequent reloading. It is often used by military and law enforcement agencies around the world due to its versatility and effectiveness in close-quarters combat.