HK UMP 9mm -Semi-Auto Bolt Group
The semi-auto bolt group is required for HK USC to HK UMP caliber conversions. The full-auto bolt carrier will not work in HK USC rifles.
Includes:
- Extractor
- Firing pin Retaining Pin
- Firing pin & Spring
Specifications:
- Tungsten filled
- Heat treated
- Parkerized
![Hornady Precision Hunter .270 WIN, 145gr, ELD-X - 20 Rounds [MPN: 80536]](https://www.tacticalwatchstore.com/wp-content/uploads/2026/10/hornady-precision-hunter-270-win-145gr-eld-x-20-rounds-mpn-80536.webp)
