Based on the M3A1 Grease Gun, this blowback action BB gun is capable of firing in semi or fully-automatic modes and has a 3-position safety switch. Features include the collapsible wire stock, drop-free 60 round magazine, fixed peep style sights, and a 1,050 BB per minute rate of fire. Powered by (2) 12-gram CO2 cartridges. Shoots approximately 120 BBs (three magazines) for each full CO2 charge.