UMP / USC Bolt Carrier Groups
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HK UMP Caliber Conversion to 9mm Kit - 7.87" Barrel - 30 Round Magazine
Michaels Machines
$1,293.95MM HK UMP, USC Conversion Kit - 9mm This 9mm conversion kit is designed for USC-to-UMP builds and allows existing .45 ACP conversions to be changed over to 9mm with a simple, drop-in parts swap. All...HKP-02286$1,293.95 -
HK USC Bolt Group - Complete - Semi-Auto - .45 ACP
H&K Heckler & Koch
$1,300.00Heckler and Koch USC .45 ACP Factory Semi-Auto Bolt Group - Complete HK German factory complete welded semi-auto bolt assembly for the USC .45 ACP. Factory assembled and ready as a complete unit...HKP-99805$1,300.00