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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    1. #8


    2. Absolutely beautiful bcg

      I purchased the nickel boron 223/556 bcg and couldn’t be more happy. It came wrapped up like they take pride in their products and shiny as can be. Customer service was excellent as well when I called to ask a question about product stock. I will purchase from them again on 23rd Feb 2021

    3. Great Deal!

      When my bolt carrier arrived I was very impressed. It was packaged perfect and the bolt was and is perfect! I was very impressed with the workmanship and the look of the assembly. Couple tat with the price and wow...I got a great deal...thanks you!! on 11th Feb 2021

    4. Amazing

      Amazing customer service, lightning fast shipping, and amazing quality. As a boutique rifle builder, I can be pretty picky about my product, but this met and exceeded every expectation. The coating is great, even with the black nitride. One of the best deals on the market today! Highly recommend! on 5th Feb 2021

    5. Smooth OPERATOR

      Yes, just like the song. Or think of Deadpool. CRYPTIC COATINGS has made me the man I am today. Well, as far as my AR bolt carrier group goes. Action packed and less cleaning after a beautiful fun filled day at the range. The aroma of gunpowder and dirt. FULL AUTO Y'ALL. At least when I get home cleaning will be a snap. Leaving more time for planning how to show off my new CRYPTIC COATINGS bolt carrier group. SINE PARI, OUT! on 4th Feb 2021

    6. Simply the best

      Quick shipping. Amazing customer service Karen was great to work with. Love this company. on 4th Feb 2021

    7. Wife is a BADA$$

      Dropped the new CRYPTIC bolt carrier group in BRONZE into my wifes .224 Valkyrie. Best idea since warming KY jelly. Thanks for the assist CRYPTIC! SINE PARI, OUT! on 3rd Feb 2021

    8. Awesome Product!

      These folks have a first rate product. Their Customer Service is Second to None! This is the fifth BCG I have purchased from them with a sixth one coming in a few weeks. I would highly recommend their products. on 3rd Feb 2021

    9. Mystic black BCG

      Fantastic part. Great quality. Very happy. on 3rd Feb 2021

    10. Top notch. I own two

      The mystic silver bcg is just amazing. It’s super slick and cycles properly without any issues. This is my second one because I couldnt imagine going back to a bcg that doesn’t provide as superior of a coating as these do. I can easily wipe clean with a dry paper towel. Most times I wipe clean and just lubricant as needed. Definitely worth the money. on 3rd Feb 2021