WMD NiB-X AR-15 Semi Auto Bolt Carrier Group Polished

Are you looking for a top-quality bolt carrier group that will provide reliable performance and easy maintenance? Then look no further than the WMD AR-15 NIB-X Semi Auto Nickel Boron BCG Bolt Carrier Group. Because this BCG has been designed and manufactured by Military defense vendors to meet WMD’s tight tolerance specifications, that makes it one of the best BCGs on the market. The NiB-X nickel boron coating provides excellent durability and corrosion resistance, while also making cleaning and maintenance a breeze. Since, all of the components of the bolt carrier group have been coated with NiB-x, they have been polished to a mirror finish. So, if you’re looking for a high-quality, easy-to-maintain BCG, the WMD AR-15 NIB-X Semi Auto Nickel Boron BCG is the perfect choice for you.

WMD AR-15 NIB-X BCG Specifications:


  • Carpenter 158
  • magnetic particle Inspected
  • Mil-Spec Gas Rings
  • NiB-X Coated for better wear Protection


  • heat-treated and hardened per Mil-Spec
  • NiB-X coated

Firing Pin –

  • Basically, manufactured per Mil-Spec
  • heat-treated, hardened, chromed


  • AR-15 Semi-Automatic
  • 8620 Steel
  • also, heat treated, and case hardened
  • NiB-X coated for durability and ease of cleaning.

Gas Key

  • Hardened to Mil-Specs
  • grade 8 hardened fasteners
  •  NiB-X coated
  • Staked per military specifications.

Cam Pin

  • heat treated, hardened per Mil-spec
  • NiB-X Coated
  • SKU# NIBXBCG0003

Made in the USA.

Additional information

Weight 1.5 lbs




BCG Coating


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