Coated Bolt Carrier Group

Coated Bolt Carrier Group

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Now available in Black Nitride!

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 insures 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 
  • 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. WOW

      I ordered the Mystic Black Monday afternoon, 10/16/17 and it shipped within a few hours that same day. I received it Wednesday afternoon and all I can say is flawless. The bolt and firing pin were already oiled. The fit and finish is beyond reproach. I'll be at the range next week to fire off some rounds.............a lot of rounds. I know this BCG will hold up to the task. By the way this company has one of the best customer service in the industry. I will be back to order again. on 19th Oct 2017

    2. Amazing work

      This is the second BCG from cryptic coatings and I could not be more pleased with the quality. I’m not someone who writes long reviews so I’ll just sum it up by saying that I will be a lifelong customer.
      on 16th Oct 2017

    3. Wow smooth as glass

      When I 1st got this I was impressed it is easily the smoothest BCG I have ever felt! I have lots of other titanium parts on my build none of them come ever close to this finish! I have not had a chance to shoot this yet but I'm sure it will be fine. on 9th Oct 2017

    4. Worth every $$$

      Good pruduct very easy clean , got the gold one , stands out from the rest of the ars,,, on 9th Oct 2017

    5. Mystic Gold

      What I was hoping for. Seems just like a tank to me, haven't gotten a chance to shoot it yet, but actually (as an experiment) broke in my action on my new build. It rubbed off all the extra grey matter from my brand new receiver without a scratch on the bcg itself. Let me say that again: My mystic gold BCG broke in my brand new billet aluminum receiver without a scratch. Obviously a tough coating, and the best looking bcg I've ever owned. Worth the money, especially if you have multiple weapons to switch it out in. Might be considering a titanium next since this is such a high quality product. on 9th Oct 2017

    6. Flawless

      Worth every penny. Will be ordering for all my future AR builds on 2nd Oct 2017

    7. Absolute perfection

      I bought this for a current build and it looks and feels absolutely amazing I have not yet had the chance to shoot with it but I know I will not be dissapointed on 25th Sep 2017

    8. Slicker than owl s***!

      I purchased the Mystic Black BCG and I must say wow! It really does make a difference in performance and ease of cleaning. This bcg is super slick and just required one wipe to clean carbon buildup from the 290+ rounds test run. Why I settled for milspec for so long is astounding. It also doesn't hurt that it looks amazing too! Buy one you won't regret it, this bcg is worth it's weight in gold! on 11th Sep 2017

    9. Best BCG!

      This is the second bolt I have purchased from Cryptic Coatings. The finish is unbelievable, the quality of their product is unsurpassed on 9th Sep 2017

    10. Exceeded My Expectations

      I ordered the bolt carrier group in 5.56 in Mystic Bronze. Looks great, shoots and performs even better! on 28th Aug 2017