Product Overview
1913 Stock Block for HK USC upper receivers being used with HK UMP lowers.
Machined from 6061 aluminum and hardcoat anodized black (Mil-A-8625 Type III Class 2).
Reuses factory mounting screws and buffer.
1913 Stock Block for HK USC upper receivers being used with HK UMP lowers.
Machined from 6061 aluminum and hardcoat anodized black (Mil-A-8625 Type III Class 2).
