Bolt Carrier Groups

WMD brings the advanced performance of NiB-X® nickel boron and other performance coatings to one of the most critical components on your AR. Our premium BCG is coated in our proprietary NiB-X® nickel boron coating and polished to a presentation-grade sheen, this top-quality BCG resists fouling, needs practically no lubrication, and can be cleaned with a quick wipe of a cloth. We offer a variety of calibers and other performance finishes on BCGs.

We’ve run thousands of rounds between cleanings without malfunctions. Military personnel have praised its performance in desert conditions (where heavy lube buildup could attract deadly dust and grime). You’ll find that it provides extraordinary reliability…while dramatically reducing the cleaning time.

Check out the specs:
Bolt – 9310 heat-treated, shot peened and batch magnetic particle inspected.  Manufactured to government drawings.  NiB-X coated.
Extractor – Manufactured, heat treated, and hardened per government drawings.  NiB-X coated.
Firing Pin – Manufactured, heat-treated, hardened, chromed and certified per government drawings.
Carrier – M16 style (heavy weight), 8620 material, heat treated and case hardened.  Manufacturing tolerances on inside diameters tightly controlled.  NiB-X coated.
Gas Key – Hardened to USGI Specifications. Staked with grade 8 hardened fasteners with knurled head and Permatex Type lll sealing compound per MIL-S-45180. NiB-X coated. 
Cam pin – Manufactured, heat treated, hardened and certified per Government drawings.  NiB-X Coated.

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