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. 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

    2. 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

    3. Rose gold BCG

      This item shipped very fast and customer service was great. The BCG looked exactly as pictured and you can really tell a difference between it and other BCG's. This one was for my wifes AR but I will be ordering another one for mine very soon. on 4th Nov 2019

    4. Slick

      As I noted other people saying, this bcg is absolute perfection. I am still waiting for the scope to arrive but hopefully in the next few days I will see how well it operates. It's probably the high point of my latest build. I topped it off with a POF tomahawk and love the feel. on 14th Oct 2019

    5. Looks incredible

      Haven’t been able to take it out yet, but this is easily the highest quality BCG I have ever purchased as far as fit and finish. on 14th Oct 2019

    6. Great Company

      I just had my first experience with Cryptic, it was great, I got the part sooner than I expected, the packaging was very nice, and the bcg I ordered was even nicer. The part works and looks great, I will be doing a lot more business with these guys. on 26th Sep 2019

    7. Awesome finish and material

      It's a toolcraft bolt. Beats out my bcm and my standard bcg by miles. I need to do a comparison with my lantac bolt but so far its held up to everything. Easy to clean easy to polish and it adds that bit of X-factor to my build that makes it more unique. Will definitely buy more. on 12th Aug 2019

    8. Perfect

      Flawless polish on all components. Haven't installed it yet but it's gonna be hard for dirt to stick to this. Looking forward to using such an excellent product. on 9th Aug 2019

    9. Super product

      I think you put out an excellent bolt carrier group, but I am exceptionally pleased with the way you do business. on 1st Aug 2019

    10. Mystic Blue BCG

      Simply Awesome! Worth every penny. Will be buying more. on 22nd Jul 2019