UMP / USC Bolt Carrier Groups

HK UMP & USC Bolt Catch Spring Compatible With: HK UMP HK USC

HK German All Steel UMP Carrier Guide This is the steel piece the guides the UMP bolt carrier. Compatible With: All HK UMP lowers

HK UMP & USC Bolt Catch  New HK German lower. Compatible With: HK UMP HK USC

New US-Made USC & UMP 9mm Extractor: This is the perfect spare part for your UMP or USC 9mm conversion.  Please Note: HK considers this a high wear and replacement item. Once it's removed from the carrier, the spring tension...

Omega HK UMP .45 Bolt Carrier Complete - Semi Auto Replacement part for USC to UMP conversions. Marked .45 semi auto just like the OEM carrier. Compatible With: HK UMP .45 Includes: Extractor Firing Pin Firing Pin Spring Firing Pin Retaining Pin The...