• NiB-X Nickel Boron finish inside and out
  • NiB-X coated - 40% more wear-resistant than chrome, and can be used in the field without lubrication and are easily wiped clean
  • Ceramic TOPCOAT adds additional protection to the carrier
  • Add a personal touch to your weapon
  • Heat-treated, shot-peened, and magnetic particle inspected to ensure high-level performance
  • Gas key secured by grade 8 hardened fasteners and properly staked
  • Available in Flat Dark Earth, OD Green, and Red


  • Caliber: 5.56 NATO / .223 Rem. / 300BLK
  • Weight: 11.64 oz.
  • Finish:
    • Bolt: NiB-X Nickel Boron
    • Carrier: NiB-X Nickel Boron with Ceramic TOPCOAT
  • Material:
    • Carrier: 8620 Steel
    • Bolt: 158 Carpenter Steel
    • Gas Key: 4130 Steel
    • Extractor: 4340 Steel
    • Cam Pin: 4340 Steel
    • Firing Pin: 8640 Steel
  • Profile: Full-Auto

**A full-auto (A.K.A. M16) bolt carrier installed in a standard semi-auto AR-15 will not make the gun fire full-auto.


  • AR-15


  • 1x NiB-X Nickel Boron Bolt Assembly
  • 1x NiB-X Nickel Boron Cam Pin
  • 1x NiB-X Nickel Boron w/ Ceramic TOPCOAT Bolt Carrier
  • 1x NiB-X Nickel Boron Carrier Gas Key
  • 1x Firing Pin
  • 1x Firing Pin Retaining Pin


Upgrade your AR-15 with WMD's higher quality colored bolt carrier group to increase your weapon's longevity while adding unique tactical style and streamlining required maintenance.

Upgrade to Higher Quality Materials Made for Long Term Use and Reduce Cleaning Time

The WMD colored bolt carrier group is made of high-quality steel coated with NiB-X nickel boron, which is 40% more resistant to wear than chrome. This coating stood up well to over 30k rounds of endurance testing performed according to Government protocols. The NiB-X coating does not require lubrication and is easy to clean, reducing the time it takes to clean your gun after shooting.

Made in America with a Lifetime Guarantee

WMD manufactures all their parts in America with the goal of their after-market parts being better quality than the factory parts you are replacing on your gun. WMD offers a lifetime guarantee on the NiB-X coating against chipping, flaking, and spalling, giving customers confidence in the quality of their colored bolt carrier group.

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Reviews (3)

  • Great product! Love it! A bunch! Always top notch. Thanks guys!

    Posted by Terryrouse on 22nd Jun 2023

    If for a top notch PCG look no further than here, just save you the best and back it up too. Thank you!

  • Nib-X coatings are 2nd to none!

    Posted by Brandon loria on 30th Oct 2022

    Love the product

  • WMD Guns NiB-X with Ceramic TOPCOAT AR-15 Bolt Carrier Group

    Posted by Ernie on 3rd Aug 2021

    I've been most impressed with the quality of workmanship. I haven't used it yet, but I'm sure it will be excellent in performance and reliability.

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