High performance semi-auto CO2 BB pistol. Powered by a 12-gram CO2 capsule (CO2 NOT included. To ensure a proper seal and for best performance, Umarex-brand CO2 is recommended.). Semi-auto shooting mode, double action trigger, and fixed front and rear sights; Optic ready with Umarex optic adapter plates accessory (item number: 2211366). Shoots .177 caliber steel BBs at up to 375 FPS. 16-round drop-free magazine; Compatible with spare magazine part number: 2252424.