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.
