AR-15/M16/M4 5.56 Full Auto Bolt Carrier Group NiB-X Nickel Boron POLISHED
AR-15/M16/M4 5.56 Full Auto Bolt Carrier Group NiB-X Nickel Boron POLISHED, All WMD BCG components are manufactured by Defense Industrial Base suppliers to WMD's exacting specifications to provide the best BCG available. Specifically engineered for NiB-X nickel boron coating to provide long life, high reliability and easy cleaning and maintenance. Coating is guaranteed for life against chipping, spalling or flaking. Over 30K rounds in Government protocol endurance testing did not wear the coating off. The Matte version of our BCGs is our same NiB-X coating in a bead bla