UMP / USC Receivers / Uppers

HK UMP Lower Locking Pin, Push Pin  For use with all HK UMP lowers & USC to UMP conversions. Made in the USA. This is the pin that holds the lower to the receiver.  Compatible With: UMP USC Conversions TBT builds Omega Other builds that...

UMP Paddle Magazine Release This is a common repair and replacement part as they are easy to break on the UMP lower. Simple and easy to install with no gunsmith needed or required. Compatible With:  UMP .45 UMP .40 UMP 9mm Please Note: This...

HK German USC & UMP Recoil Buffer Replaceable spare lower housing or buffer for buffer housings. This is a high wear and replacement item and a must-have for spare parts. Compatible With: HK USC .45 HK UMP models

H&K USC (.45 ACP) Carbine Mag Release This is a great replacement as they are prone to breakage & wear. Please Note: For those that have a USC with a bullet button and are moving to a free state and want to revert back to the...

HK UMP & USC Right Side Hammer Spring For Lowers - USA

HK UMP & USC Bolt Catch For Last Round Hold Open New HK USA lower bolt catch. Compatible With: HK UMP HK USC

H&K UMP (.40 S&W/.45 ACP/9mm) Lower Backplate HK German Backplate for all UMP lowers. You will need to add your existing buffer or order one to make a complete buffer assembly.

HK German USC Magazine Release Axle This is a great replacement as they are prone to breakage and wear. These are also a missing part in some states where bullet buttons are required. This part is compatible with all HK USC...

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

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 - 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 German Factory UMP  Receiver Section - Extended Demilled factory HK UMP rear receiver section perfect for a USC-UMP conversion. With the folding stock attachment point intact right in front of the ejection port, this extended receiver section is...