WMD AR-15 NIB-X Semi Auto BCG Bolt Carrier Group with hammer Polished

Vendor: WMD Guns


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

The WMD Guns NiB-X AR-15 Semi Automatic Bolt Carrier Group is manufactured by Military defense vendors to WMD tight tolerance specifications to provide the best bolt carrier group  available. This BCG has been engineered for NiB-X nickel boron coating to provide long life, high reliability and easy cleaning and maintenance. The components of the bolt carrier group have been NiBx coated and polished.



  • 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 -

  • Manufactured per Mil-Spec
  • heat-treated, hardened, chromed


  • AR-15 Semi Automatic
  • 8620 Steel
  • 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