Players can now experience the perfection of a .43-caliber GLOCK replica. This extra 8-round magazine, which can hold either paint- or powderballs in caliber .43, also accommodates a 12-gram CO2 cartridge that can be swapped without tools in seconds when on the field. When you need a new cartridge, you just insert it and pierce it with a light blow at the bottom of the magazine. Suitable for all T4E Roundballs in cal. .43. Officially Licensed Product of GLOCK.