WMD Guns NIB-X Bolt Assembly – AR-15 / 5.56 NATO

The WMD Guns NIB-X Bolt Assembly is a drop-in replacement bolt for AR-15 platform rifles chambered in 5.56 NATO or .223 Remington. This complete assembly includes the bolt, cam pin, and firing pin, all coated with WMD's proprietary Nickel Boron (NIB-X) treatment. Upgrading to a NIB-X coated bolt reduces friction, simplifies cleaning, and improves reliability in adverse conditions compared to standard phosphate or chrome finishes.

The NIB-X coating provides exceptional lubricity and corrosion resistance while maintaining precise tolerances. The self-lubricating properties mean less oil is required during operation, and carbon fouling wipes away easily after shooting. This is a direct replacement requiring no gunsmithing—simply disassemble your bolt carrier group and swap components. Ideal for shooters looking to extend bolt life or improve performance in duty, competition, or high-volume training environments.

• Part Type: Complete Bolt Assembly
• Compatible Firearms: AR-15, M16, M4 (5.56 NATO / .223 Remington)
• Material: Steel with NIB-X Nickel Boron Coating
• Finish: Nickel Boron (NIB-X)
• Installation: Drop-In (no gunsmithing required)
• Includes: Bolt, Cam Pin, Firing Pin