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WMD NiB-X Coating Bolt Carrier Group Matte Finish M4/M16/AR-15 Full Auto
Nickel Boron Coating. Harder than Tennifer, Melonite, Nickel Teflon and Hard Chrome (NiB-X is Rc72). Environmental corrosion protection. Very lubricious (CoF .07). Easier to clean - wipes clean in most cases. Less maintenance - longer usage between cleaning cycles and enhanced performance. Lifetime warranty from chipping, flaking or wear.