Umarex Steel Storm CO2 BB Gun Full or semi-auto 6-round burst mode in full-auto .177 caliber Matte black stock Max. velocity: 430 FPS 30-round magazine 300-round BB reservoir Full-length Picatinny optics rail Picatinny accessory rail under barrel Fixed front and rear sights Barrel length: 7.5" Overall length: 15" Weight: 2.7 lbs. Uses two 12-gram CO2 cartridges (not included)