Take your HK USC from factory to fun without braking the bank. Install this high quality after market upgrade kit that allows you to utilize a folding rear stock and a 30 round M3 Grease Gun magazine. This kit is a 922r compliant part and counts as 5 US parts (with the use of the M3 mag). The USC only requires 3 US parts to be 922r compliant. The kit is made of a glass filled polymer nylon, similar material to USC. There is one simple modification that is needed to be done to the USC upper. The magazine access hole has to be opened to allow the wider M3 magazine to reach the bolt. Transfer your internal trigger parts and you are on your way to the shooting range. Installation instructions included.

Get your M3 Grease Gun Magazines HERE

Part # USC-4     Cost $225.00     In Stock

(922r compliant part)  (Counts as 5 parts)