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. 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

    2. 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

    3. 5.56 Bronze finish

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

    4. 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

    5. Great BCG

      This was my first Cryptic BCG (Mystic Black). I shot 200 rounds through my 6.8 SPC. The function was flawless, and the cleaning after shooting suppressed was effortless. on 16th Dec 2019

    6. 3rd time buyer

      This is my 3rd Cryptic bcg. Mystic black, silver and now bronze. They r the best bcgs on the market. The finish is slick. After a long day of shooting, they wipe clean w a rag! Never had an issue w/ any of em. An extra bonus is they look Gucci! Awesome company to deal with. Summer is manning the phones, and will take great care of you! on 12th Dec 2019

    7. Gold BCG for my 6.5 Creedmoor build

      Beautiful and looks great. Seems to be well worth the price compared to others BCG that I have looked at. This one was purchased on a Black Friday sale and was received quickly via UPS. It was well packaged and built like a tank. Looking forward in finishing my build. I know this review might be premature since I didn't shoot it yet, but based purely on looks and aesthetics, it is top notch. If it meets my expectations in performance, I will buy a few for my already built AR15 platforms. Thanks Cryptic for such a nice piece. on 6th Dec 2019

    8. Just awesome mystic black

      I love this bolt carrier I have bought two of them already 308 and 223 best engine for a ar style platform on 4th Dec 2019

    9. Usual Great quality

      (This one is Mystic Blue)

      3rd Cryptic BCG, all 3 have been flawless. Finish is amazing, slick as hell, and it just looks good ;).
      on 4th Dec 2019

    10. Coating looks amazing.... have not shot yet.

      The bronze coating looks amazing. Unfortunately I haven’t tested the BCG yet, but looking forward to that. on 28th Nov 2019