The Winchester Air Rifle Model MP4 features a rifled steel barrel, metal receiver and durable composite stock, pistol grip and forearm. The stock is collapsible and includes a sling swivel. The tactical forearm quad rail system has an extended top rail and sling swivel. The Winchester Air Rifle MP4 is a semi-automatic, dual ammo air rifle which shoots BBs as well as all styles of standard .177 caliber pellets. The clip holds two 12 gram CO2 cylinders to produce a maximum muzzle velocity of 700 feet per second with lead pellets. Load two CO2 cylinders into the clip then insert it into the gun. The clip also holds an ammo magazine with an 8-shot rotary 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. For adults and those 16 and older with adult supervision.