The Umarex HK USP CO2 Airsoft Pistol is an excellent choice for fast, accurate target shooting and airsoft matches. This airsoft gun is modeled after the popular H&K semiautomatic pistol and powered by 12-gram CO2 cylinders (not included), firing 6mm BBs at velocities of up to 350 fps. Fixed sights. 16-round capacity. Double-action only. Modeled after popular HK semiautomatic pistols Powered by 12-gram CO2 cylinders (not included) Fires 6mm BBs at velocities of up to 350 fps Fixed sights