Umarex HK USP 16-Round CO2 Arisoft Magazine Plastic Black. 243 Caliber Gun Type: Airgun Package Contents: Umarex HK USP 16-Round CO2 Arisoft Magazine What firearm models does the manufacturer say Elite Force HK USP 16-Round CO2 Arisoft Magazine Metal Black 2262033 is compatible with? The manufacturer says that Elite Force HK USP 16-Round CO2 Arisoft Magazine Metal Black 2262033 is compatible with Heckler & Koch USPUmarex 2262034: HK USP 16-Round CO2 Arisoft Magazine Plastic Black