Optimized to meet all the requirements of ambitious competitors; 8-round magazine can hold either paint or powderballs in. 43 caliber, and also accommodates a 12-gram CO2 cartridge (not included) that can be swapped without tools in seconds when on the field. The polymer frame accommodates original backstraps, the rear light is compatible with tuning parts of the GLOCK accessories market, and extremely tight manufacturing tolerances ensure a secure fit in most standard holsters. 1x 25 count Co2 Cartridges.