The Winchester Air Rifle model M14, with durable composite stock, is a semi-automatic, dual ammo gun which shoots both BBs and pellets. The CO2 clip holds two standard 12 gram cylinders to produce a maximum muzzle velocity of 700 feet per second. Load two CO2 cylinders into the clip then insert it into the gun. The clip also holds an ammo magazine with an 8-shot cylinder at each end...for a total of 16 shots. Load BBs, pellets or any combination of BBs and pellets into the magazine then re-insert the magazine into the clip. After 8 shots, flip the clip to continue shooting.