HK USP Gas CO2 Blowback Spare Magazine - 18 Rounds

A HK USP Gas CO2 Blowback Spare Magazine - 18 Rounds. Fully licensed Heckler & Koch mag. Fits in the airsoft HK UPS full blowback gun (gun # 2275043). Does not work in the cheaper Co2 non-blowback model. 18 Round magazine full metal. Uses Co2 cartridges.