WMD Guns Part Nib-X Carrier Group Without Hammer NIBXBCG-0001 The WMD Bolt Carrier Group is precisely machined from high-grade steel to M16 specs before receiving WMD's proprietary NiB-X nickel boron coating. This coating results in super-smooth action, extreme corrosion resistance, and a harder-than-chrome surface that prevents carbon fouling from adhering, making this an ideal choice for any one who does high-volume shooting. This set features a matte finish and does not include the hammer.
