WMD NiB-X AR15/M4 Full Auto Bolt Carrier Groups

(19 reviews) Write a Review
1.10 LBS
  • WMD NiB-X AR15/M4 Full Auto Bolt Carrier Groups
  • WMD NiB-X AR15/M4 Full Auto Bolt Carrier Groups
  • WMD NiB-X AR15/M4 Full Auto Bolt Carrier Groups

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Frequently bought together:


Bolt – Carpenter 158 heat-treated, shot peened and magnetic particle inspected. Manufactured to government drawings. Mil Spec gas rings. NiB-X Black coated (40% more wear-resistant than chrome).Extractor – Manufactured, heat treated, and hardened per government drawings. Black extractor buffer and heavy-duty spring. NiB-X Black coated. Firing Pin – Manufactured, heat-treated, hardened, chromed and certified per government drawings. Carrier – AR-15 or M16 style (heavy weight), 8620 material, heat treated and case hardened. Manufacturing tolerances on inside diameters tightly controlled. NiB-X Black coated for durability and ease of cleaning. Gas Key – Hardened to USGI Specifications and attached using grade 8 hardened fasteners. NiB-X Black coated. Staked per military specifications. Cam pin – Manufactured, heat treated, hardened and certified per Government drawings. NiB-X Black coated.


  • Bolt Finish Nickel Boron
  • Bolt Material Carpenter 158 Steel
  • Brand WMD Guns
  • Caliber Gauge 5.56 NATO
  • Carrier Finish Nickel Boron
  • Carrier Material 8620 Carpenter Steel
  • Carrier Style M16 Bolt Carrier
  • High Pressure Tested Untested
  • Magnetic Particle Inspect Magnetic Particle Inspected
  • Platform AR-15
  • Weight 12 Oz

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. (California law requires this warning to be given to customers in the State of California.)

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Additional Information

Product ID:
Complete Bolt Carrier Group
Made In USA
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19 Reviews

  • 5
    Bad ass!

    Posted by AP on 2nd Dec 2016

    Bad ass!

  • 5
    Very slick

    Posted by William j. on 25th Oct 2016

    Very slick

  • 5
    Great BCG!

    Posted by Shawn B. on 3rd Apr 2016

    Great BCG!

  • 5
    Very nice fit and finish

    Posted by Nathan D. on 31st Mar 2016

    Very nice fit and finish .. Must have for your serious build and a must as a upgrade

  • 5
    Very satisfied.

    Posted by RENE Y. on 17th Mar 2016

    Very satisfied.

  • 5
    Absolutely a great product for

    Posted by JEFF B. on 17th Feb 2016

    Absolutely a great product for the best Price!

  • 5
    works great, nice workmanship. Will

    Posted by steve l. on 23rd Dec 2015

    works great, nice workmanship. Will buy again. Shipped fast

  • 5
    I'm very happy with the

    Posted by Kenneth W. on 28th Jun 2015

    I'm very happy with the product fit & function, price, and BOTACH!

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