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 
  • 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. Great customer service and products

      Purchased the mystic black BCG for my new pistol build. I put about 30 rounds through it and noticed the coating was chipping off on the cam pin. To be fair that is a part that gets a lot of abuse. I contacted cryptic coatings and they sent me a brand new BCG with little effort on my end. Thank you Karen, I will be buying from Cryptic Coatings again. on 29th Mar 2020

    2. It's the only BCG I use!

      Since my first Cryptic Coatings BCG I was sold on the quality and reliability of the product. Simply the best -- Mystic Blue, Silver, and Black are my "go to" coatings -- I see no reason to use anything else! on 23rd Mar 2020

    3. Excellent BCG!

      What a clean finish!! I got this .458 SOCOM BCG for my AR where it fits into the barrel perfectly, and I love it!! Great price, too! on 9th Mar 2020

    4. well worth it

      Got one of these in the mystic black for my daniel defense isr gen 2 and what a huge improvement over the stock bcg. This is the real deal just need a clean rag and the carbon from suppressed shooting wipes right off. I'll definitely pick up another one of these. Thanks on 9th Mar 2020

    5. Fast and SLICK

      Being a lefty, I figured I'd have to wait a few weeks, at least, to see that my order had shipped. NO, it shipped the NEXT DAY! Even when ordering the LH Mystic Blue. And this thing is SLICK with an amazing finish. Haven't put any rounds down range yet, but I am already 100% happy with this purchase! on 8th Feb 2020

    6. Amazing !

      Cryptic Coatings comes through again, FANTASTIC products and service as usual ! on 20th Jan 2020

    7. So easy to clean.

      I picked up the black nitride left hand bcg for my AR. Ran a 160 rounds with it. All I had to do is put so clp on it and wiped it off. on 16th Jan 2020

    8. Mystic blue

      So glad I finally pulled the trigger on this. The Bcg shipped very fast in good packaging. This Bcg literally slips out of your fingers and everything is coated beautifully. Took it to the range and it made the rifle run so much smoother. If you’re on the fence because of the price just go for it. You won’t be sorry. on 13th Jan 2020

    9. 5.56 Bronze finish

      Great price. Put one hundred rounds through AR hardly dirt. Cleaning is so easy. Great product!!!! on 1st Jan 2020

    10. 2nd BCG

      Hi I've recently purchased my second BCG due to the fact I blew my other rifle up with a hot load. The BCG held up way better than I thought taking the blunt of the damage. It's very possible that it even saved my face from being blown off. I give this product 5 stars for durability and looks. This product is everything the company advertised and then some. Great job guys keep up the good work. on 26th Dec 2019