Description
Factory HK UMP .40 Cal. bolt and barrel modification services/re-chambering to 10mm. Remember, UMP machine gun bolts will need to be machined to fit a semi auto receiver ( USC, USC conversion, Omega, etc… ) See options/selections.
Requires 10mm magazines or modified 40 mags. We can modify magazines for you or you can purchase the 10mm UMP ( modified ) mags as necessary.
- Send in YOUR UMP parts for modification
- 10mm conversion/machining by Black Ops Defense
- Choose bolt machining option as needed
- Magazine modification is not included
