Factory HK UMP .40 Cal. bolt and barrel modified/re-chambered to 10mm. Full auto parts kit. Will work with UMP machineguns or with semi auto conversions ( USC, Omega, etc… ) with additional bolt machining. 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.
- Trade-in/used parts, good condition
- Factory HK cone flange
- Full auto/machinegun feed ramp
- 10mm conversion/machining by Black Ops Defense