UMP / USC Receivers / Uppers

HK USC & UMP Slide For Lower - German New HK German USC slide for conversion of UMP lower. 

Heckler and Koch USC .45 ACP Magazine Release Axle Replacement magazine release axle for HK USC .45 ACP platforms. This component is commonly replaced due to wear or breakage and may also be required when configuring compliant magazine release systems...

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

HK USC Lower Locking Lever Axle A great item to have on hand as spares. New German HK. Compatible With: All USC lowers

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

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 ...