Blistering full auto speed and realistic weight and feel make the Umarex StrikeForce Air Rifle ideal for skill development and fun. Dual action full-auto or semi-auto firing modes; 30-round drop-free magazine. Powered by two 12-gram CO2 capsules (CO2 NOT included. To ensure a proper seal and for best performance, Umarex-brand CO2 is recommended.). Shoots .177 caliber steel BBs at up to 450 FPS. Multiple mounting options for accessories and includes adjustable and removable flip-up sights and a speedloader; Compatible with spare magazine part number: 2252133.