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. In love with this bcg

      Purchased mystic gold and it is gorgeous not to mention runs like a top. Super easy to clean aswell its like carbon cant even stick to it on 19th Feb 2018

    2. Mystic black

      I have 2 mystic BCGs now. One black and one copper. Love both of them. No failure to feeds/eject. Never have any head spacing issues or lock up issues. Easy to clean... ran into 1000 rounds in a weekend without cleaning it and no problems ever and wiped the majority of the BCG clean with a rag. Some places required a nylon brush but after 1000 rounds name something that doesn't need a soft tip brush... great product. Will go in any build I do. on 19th Feb 2018

    3. Smooth

      Smoothed out the charging of my rifle and makes cleaning a breeze. Will be getting Cryptic Coating BCGs for all my AR builds. on 18th Feb 2018

    4. Nice BGC!

      High quality, will be purchasing more! on 11th Feb 2018

    5. Looks great

      Looks great and fast shipping, still waiting on my upper to try it out but so far it’s great on 7th Feb 2018

    6. Awesome!!

      I have purchased a 5.56 nickel boron bcg in the past and it was perfect. Easy to clean and amazing functioning. The 308 nickel boron bcg I more recently purchased and received is also flawless. I have yet to put it in action, but it appears to have the same qualities as the much smaller 5.56 bcg. Thanks cryptic coatings for your amazing products! on 8th Jan 2018

    7. Wow, just wow!

      Just got it yesterday and all I can say is WOW!

      Super smooth and a flawless finish. I picked up the Mystic Bronze and could not stop staring at it last nite!
      I'll post an update after I put some rounds through my 6.8spc, but from all the written and video reviews I read and watched online prior to buying it, I don't foresee and issues.

      Quick shipping considering I ordered over the christmas/new year holidays.

      on 4th Jan 2018

    8. 1000 Rounds with Echo Trigger

      Slid this BCG into a system with a Echo trigger setup, ran non-stop thru 1000 rounds, not a single FTF or FTF. Ran flawlessly. Clean up was much easier than standard treatment, still needed to get the stiff brush out for it, but the build up came off much easier. Excellent purchase and will be upgrading other setups. on 3rd Jan 2018

    9. Rose Gold BCG

      Been wanting this bcg for a while now,Was on sale and ordered it(rose gold).Its so nice,can't wait to use it.Just thinking of the time I will save cleaning,plus bragging rights make it worth it.The reviews and videos on these bcg are out standing.I had nib bolts and after 30-100 rounds they were flaking at the lug,had them replaced and same problem plus cleaning them were a chore.The feel of this is so smooth/slick.You will be so happy to have a great bcg thats easy to clean ,and cycles so well you'll kick your self for not getting one sooner...Thank you... on 3rd Jan 2018

    10. A+ Amazing bcg!

      All I can say is thank you for a great bcg! As a US Army veteran I wish I would have had this bcg when we were spending hours cleaning our rifles! I've had or have all types of "coated" bcg's and this is by far the "slickest" I have seen there is no comparison! Headed out tomorrow to put some rounds down range and have no worries that it will perform as advertised! Thank you again! on 3rd Jan 2018