WMD NiB-X Nickel Boron 5.56×45 Bolt AR-15

This complete AR-15 Bolt assembly comes pre-built with gas rings, extractor, and ejector. The bolt itself features WMD’s proprietary NiB-X nickel boron coating which offers a high-lubricity for drastically reduced wear, maintenance, and oiling, and harder-than-chrome surface that will hold up to thousands of rounds of use. As an added benefit, it is also extremely easy to clean.