WMD Black NiB-X Bolt Carrier Group 5.56
WMD Black NiB-X Bolt Carrier Group. M4/M16/AR-15 Full Auto. Hi corrosion resistance, lubricity (CoF .07). Easier to clean - wipes clean in most cases. Less maintenance - longer usage between cleaning cycles and enhanced performance. Lifetime WMD warranty from chipping, flaking or wear.