Coated Bolt Carrier Group

Coated Bolt Carrier Group

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Coated bolt carrier group (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the proper chrome lined and heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel and shot peened for increased strength per Mil-Spec; includes tool steel extractor with spring and viton O-ring; firing pin chromed finished with firing pin retaining pin and cam pin.

HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).

Complete Mil-Spec M-16 Bolt Carrier with Bolt Assembly HPT/MPI Tested:

  • Mil-Spec BCG Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC
  • Mil-Spec Chrome Lined Carrier Interior
  • Mil- Spec Chrome Lined Gas Key
  • Key Staked with Grade 8 Screws, per Mil-Spec
  • Mil-Spec Carpenter 158® Bolt w/ Spring and Ejector (Black Nitride BCG's only available with 9310 bolts)
  • Tool Steel Extractor w/ Spring and viton O-ring
  • Mil-Spec Firing Pin w/ Chrome Finish
  • Mil-Spec Cam Pin
  • Full Auto Carrier (Backward compatible with all semi-auto rifles)
  • 5.56 BCG Weight - 11.55 oz.
Calculated at checkout
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  • Product Reviews


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    1. High quality

      Everything perfect out of the box - all surfaces smooth and deburred, bolt/carrier fit is excellent, and of course the finish is well done. Haven't shot it yet. on 1st Feb 2021

    2. Cryptic black nitride .308 BCG

      Product shipped same day it was ordered and was exceptional quality. Made a mistake on my billing address and the customer service when I called was excellent. Very friendly and willing to answer any questions. Will be a returning customer on 25th Jan 2021

    3. beautiful

      Purchased in mystic black. Its so nice looking its almost a shame its hidden in the reciever. The coating is very slick feeling like its permanently lubricated. Will be a go to part for all future builds. on 24th Jan 2021

    4. Phosphate .308 BCG

      Excellent product and service. I got the regular phosphate coated bcg and the finish is flawless. It was delivered in 2 days and came in a very well packed box. They included a nice microfiber cleaning cloth and a cool sticker. Time to sling some lead! on 13th Jan 2021

    5. Worth every penny!

      This is my second BCG purchased from Cryptic Coatings, and both of them have made already great rifles even better in terms of smooth operation and reliability. Awesome products!! on 11th Jan 2021

    6. Amazing

      I’m going to start using these in all my builds. on 6th Jan 2021

    7. So far so good

      Packaging alone was a serious plus. It came wrapped in bubble wrap, wrapped in a cleaning cloth, wrapped in a protective webbing along with 2 mints and a sticker. The box itself also was thoroughly lined with bubble wrap. The coating is shiny and solid, but the lube was frozen due to me being in an Alaskan winter. The bolt is extremely snug to the bolt carrier which makes me confident in it’s functionality. If it lives up to literally ever other review I’ve seen then I’ll be happy. I will say I did clean it with Shooter Lube’s solvent and then relubed from there but otherwise everything is untouched. I’m excited to have it. on 17th Dec 2020

    8. Top of the line!

      Excellent coating! Extremely tough and so so easy to clean! I won’t use anything else! on 15th Dec 2020

    9. Slicker than slick

      This is a 3rd or 4th bolt Carrier group I have ordered and I have had nothing but satisfaction for such a great product!
      I would never use anything else!
      on 7th Dec 2020

    10. BCG

      I got the mystic silver BCG and I don’t think I could be happier. Looks great and while I haven’t had fired the AR I’m building yet... can tell this is going to make cleaning much easier on 7th Dec 2020