Also known as the P90 submachine gun, it is a personal self-defense weapon developed by the Belgian company FN in 1986. Known for its unique appearance and modular design, the entire gun is approximately 50cm long and features a dockless structure, making it lightweight and easy to carry. The bolt and barrel are both housed in a compact box shaped receiver, which is placed above the barrel axis and has a large capacity of 50 rounds. Using SS190 bullets with a caliber of 5.7mm, the initial velocity reaches 850m/s, the effective range is 150 meters, and the firing rate is as high as 900 rounds per minute. The design emphasizes ergonomics, suitable for both left and right handed use, and easy to disassemble and maintain.