UMP / USC Barrels

MM 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 components install in minutes and are built to...

HK UMP .40 S&W Caliber Conversion Kit - Used Complete conversion kit designed to convert HK UMP and compatible .45 caliber sub-gun platforms to .40 S&W. This kit includes factory German HK components and installs as a drop-in conversion. Machined...