UMP / USC Receivers / Uppers

HK USC Alloy Mag Release - Extended Billeted alloy USC magazine release. This is a very common repair & replacement part as they are fairly easy to break on the USC lower. With this new metal mag release you get more surface area as well as a much...

HK UMP Demilled Receiver Section This is a demilled factory HK UMP rear receiver section that is perfect for the new Tom Bostic USC-UMP conversions. This section is the perfect length in order to do the USC/UMP conversion. Last one available.

UMP Paddle Magazine Release - US Made New UMP Mag release. This is a very common repair & replacement part as they are fairly easy to break on the UMP lower. Simple & easy to install no gunsmith needed or required. Compatible With: UMP .45 UMP ...