TSD Silver 1911 Co2 Non-Blowback Pistol. Unique High Grade Non-Blowback, uses standard 12 gram CO2 Gas (CO2 Cartridges sold separately). Semi-Auto Heavyweight! Economical on gas because of the Non-Blowback feature (no moving slide). Magazine holds 15 rounds. Also, Innovative design conceals the CO2 Cartridge in the grip. No unsightly excess magazine sticking out the bottom of the grip. Comes with FREE Gun Carrying Case!