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...

Heckler and Koch Paddle Magazine Release for HK UMP 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 Please...

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

HK UMP & USC Cocking Lever New HK German part. Compatible With: HK UMP HK USC

HK UMP & USC Magazine Release Spring HK German factory mag release spring for all USC and UMP mag releases.  Compatible With:  USC lowers UMP lowers

Heckler and Koch .45 ACP Carbine Magazine Release for HK USC This is a great replacement as they are prone to breakage and wear. Please Note: For those that have a HK USC with a bullet button and are moving to a free state and want to revert back to the...

HK German UMP Lower Locking Pin For use with all HK UMP lowers and USC to UMP conversions. New HK German manufacture.  

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

HKP HK Parts Enhanced Paddle Magazine Release for HK UMP 9mm, .40 S&W, .45 ACP This is a very common replacement part as they are fairly easy to break on the UMP lower. With this new mag release, you'll get a wider release as well as a much more...

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

HK Heckler and Koch .40 S&W, .45 ACP, 9mm Lower Backplate for HK UMP HK German Backplate for all UMP lowers. You will need to add your existing buffer or order one to make a complete buffer assembly.

Top Rail - HK USC / UMP TommyBuilt anodized aluminum high rise top rail.  Includes mounting hardware. Compatible With: HK UMP HK USC TMP UMP clone