Description

HK UMP/USC (9mm) Semi Auto Bolt Carrier

The semi-auto bolt group is needed for HK USC to HK UMP caliber conversions. The full-auto bolt carrier will not work in HK USC rifles.

 Specifications:

  • Tungsten Filled
  • Heat Treated
  • Parkerized & polished
  • Includes extractor
  • Marked 9X19mm, just like the OEM carrier.