WMD Guns NIB-X BCG with Hammer – AR-15 / 5.56 NATO

The WMD Guns NIB-X Bolt Carrier Group with Hammer is a complete drop-in replacement BCG designed for AR-15 platform rifles chambered in 5.56 NATO/.223 Remington. This BCG features WMD's proprietary NIB-X nickel boron coating, which reduces friction and carbon buildup for easier cleaning and improved reliability under sustained fire. The included hammer is coated with the same NIB-X finish for consistent performance across your fire control system.

NIB-X coating provides a self-lubricating surface that maintains function even when dry, though proper lubrication is still recommended for optimal longevity. The nickel boron finish is extremely hard and corrosion-resistant, outperforming standard phosphate or chrome coatings in wear testing. Installation is straightforward—this is a drop-in component that requires no fitting or gunsmithing. Simply remove your existing BCG and hammer, install these NIB-X coated parts, and reassemble.

• Part Type: Bolt Carrier Group with Hammer
• Compatible Firearms: AR-15, 5.56 NATO / .223 Remington
• Material: Mil-spec 8620 steel carrier, 9310 steel bolt
• Finish: NIB-X Nickel Boron coating
• Installation: Drop-In
• Includes: Bolt carrier, bolt assembly, cam pin, firing pin, retaining pin, coated hammer