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. Absolutely incredible

      If you are on the fence about purchasing a BCG from these guys, don't be.

      Are they expensive? Do you have to sell one of your kids to buy one? Yes. Is it worth it? Yes.

      When people at the range look over and see your brand new Cryptics Coatings BCG sliding back and forth in your receiver as if friction didn't exist, soon they will be selling their children also.

      Buy one.
      on 20th Aug 2017

    2. The best of the best!

      I am blown away by this BCG! Well over 1000 rounds on this thing and it performs flawlessly! Never had a BCG as easy to clean! I will definitely be buying another and another! on 12th Aug 2017

    3. Amazing Bolt Carrier Group!!!!

      I purchased the mystic sliver coated bolt carrier group for my 300blk build, the shipping was fast. The bolt functions so smoothly and looks amazing in my rifle, I've gotten a number of compliments on it already and I've only taking to the range twice. I will be ordering another one to replace the bolt in my 5.556 soon!!!! on 4th Aug 2017

    4. Once again blown away!!

      A few days ago I received my 2nd cryptic bolt Carrier the 1st one was in my very 1st AR And it functioned flawlessly the coating on it is on believably Amazing! This time I opted to go with the cryptic black in man does it look good in my new AR pistol with the Eco trigger AR2 it runs like crazy! Thank you For once again delivering an amazing product!! on 31st Jul 2017

    5. Another great purchase

      I own the gold 308 bcg and now the NiB 5.56. Great products all around. Great customer service. Keep up the good work!!! Maybe one day you can make a coated Kriss Vector bcg? on 30th Jul 2017

    6. Awesome

      Great product. Definitely buying a third. on 26th Jul 2017

    7. Black nitride bolt carrier group

      I purchased the black nitride bcg. Put it in my rifle build, fired the first shot and she felt smooth. You can definitely tell the friction is low and no carrier tilt. I haven't put a whole lot of rounds through her yet to run it hot and get the carbon building but this bcg cycles as it should and cleaned up nicely with provided cloth without much effort. Im completely satisfied and would definitely recommend this company's products! Shooting to try out the mystic black bcg for the next build! Thanks cryptic coatings for the great product! on 22nd Jul 2017

    8. Well done!

      Not a writer by trade, but here goes. Ordered the black coated one. Received the product in a very timely manner. I believe I ordered it on a Saturday and it was at the house by Wednesday. They are not kidding about the friction coefficient. The thing is a little hard to hold on to. Lightly oiled it, put it in the rifle. 200 rounds later, pulled it out. A little dirty, but not bad. Just wiped it off with the provided cloth, took 2 mins tops. Good as new. Re-oiled and back in the gun. Cycled perfect, easy to clean, and looks awesome. Will update after the 2,000 round count. on 13th Jul 2017

    9. Very Impressive!

      This thing is so slick! By far the slickest bcg I've ever seen. Highly recommended. on 12th Jul 2017

    10. Slick!

      Bought this for my 300blk SBR, knowing it'd be a pretty dirty firer with a can on it. needless to say, cleaning is super easy with this glossy coating.

      The added touch with the hand written note of thanks a week or two later was a nice touch. Will be doing business with again!
      on 11th Jul 2017