NIB-X Bolt Assembly .223/5.56
NIB-X Bolt Assembly .223/5.56, WMD's Bolt Assembly 5.56, NiB-XA(R) is Optimized for performance. The bolt was engineered for NiB-X nickel boron coating to provide long life, ease of cleaning and superior locking and unlocking action with barrel extensions. 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.