This is a WMD Guns Bolt Carrier Group, model NIBXBCG0001-BLK.
BCG components are NiB-X coated and polished to reduce fouling adherence. Coating is guaranteed for life against chipping" spalling or flaking. Over 30K rounds in Government protocol endurance testing did not wear the coating off. Especially beneficial in short barrel setups and suppressed platforms.
Features:
Easy Cleaning and Maintenance
Heat Treated
Reduced Fouling Adherence
