The Crosman QR Magazine cuts down on the time you spend reloading! The magazine holds two CO2 cartridges and comes with a 300-round BB reservoir with an integrated speed loader mechanism, reload in seconds. Compatible with the Crosman, DPMS, and Bushmaster full-auto BB air rifle series for hours of fun. Does not work with the Crosman CAK1.Features :Reservoir Holds 300 RoundsSpring Feeds 22BBs for Rapid FireIntegrated Speed Loader Mechanism Reloads in SecondsHolds Two Powerlets CO2 CartridgesCompatible with Crosman, DPMS and Bushmaster Full-Auto AR Series