The NEW 100 Round STEEL Drum quickly attaches and detaches to you gun allowing for simple loading and firing of the SMG 22. This additional 100 Round drum, in conjunction with an extra belt (sold separately), allows you to reload in a hurry. Once each round is fired, the belt links feed back into the drum. After firing through 100 rounds, simply open the drum and remove the empty belt and you are ready to load another 100 rounds into the drum. The NEW 2 piece STEEL, hinged design drum is the same drum that ships with the SMG-22 Pellet Gun, after serial number SMG 00120, but is compatible with all SMG 22's.