The HK USP Compact GBB airsoft pistol is a perennial favorite sidearm for airsoft players around the world.  Don't get left without a spare magazine on the field! This 22 round GBB mag is the ticket for fast reloads with your HK USP C platform.
 
Notes: This magazine fits HK USP Compact SKU 2275004 and accepts magazine rebuild kit 2211106