Collapsible Stock. 6-shot burst "full-auto" action. Semi-auto action. Powered by 2x12g CO2 capsules. CO2 Housed in the Collapsible stock. 30-round BB magazine with 900-round reservoir. Integrated tactical railing. Flip-up front and rear sights. Umarex Steel Strike CO2 Air Rifle is a fast action rifle built for speed with its 6-shot burst. Don't worry about running out of ammo with its 30-round BB magazine that also has a 900-round reservoir.