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. Very Nice

      I ordered a Black Nitride BCG for one of my rifles. This is by far the nicest Black Nitride BCG I have ever seen. Smooth, slick, and flawless. This has certainly got me excited to eventually acquire one of the Mystic Black BCG's. The fact that Tool Craft BCG's are used, just add to the amazing quality. The packaging of the BCG displayed the obvious pride that Cryptic Coatings takes in their products. Well protected and mints in the box! I will only be purchasing Cryptic Coatings BCG's in the future. on 17th May 2018

    2. Amazing BCG

      MPI test marked even when coated. No HPT mark. But I’m sure it is sense it’s a tool craft BCG. Got the silver one and I like what I see. Haven’t shot with it yet but I put it in the rifle to see how smooth it is. It is extremely smooth and the Finnish looks like a gem. I almost hate to use something so shiny. However, I’m sure this will dramatically improve the reliability of my already reliable AR-15. Would buy again, and would highly recommend the product. on 2nd May 2018

    3. Mystic black is mystical !

      Easily the best BCG i own,,, and i own a bunch ! And these guys are the best! I requested the firing pin Be coated in Mystic Black also ! And they did it at no charge! They commented that they had never had this request before,,,, Im sure they are still wondering why! Well here is the story of why!

      I shoot carbine competition and I load my own ammo I use a very accurate powder that has one drawback,,, its VERY Dirty and at one competition match the round counts where higher than normal and i had neglected cleaning my BCG from the last couple matches... Well on the last stage the firing pin gummed up so bad that my firing pin would not ignite the primers! I ended up getting (DNF) (Did Not Finnish) and that absolutely killed my score for that match! I ended up coming in second to the last place!

      So I hope now, Cryptic Coatings understands the request to coat the firing pin . Its a reliability thing for me , the slicker a part is the less residue and dirt can stick to it, and make it fail !!!

      Thanks, Cryptic Coatings...

      It was worth the wait ...

      Gary J,,, Blackfoot Idaho
      on 26th Apr 2018

    4. amazing quality

      I purchased the mystic bronze bcg 5.56 for my harden arms 10.5 upper. the finish on the bcg is beautiful, feels like glass functioned perfectly in my upper. cleaned up so easy too. will definitely be purchasing my next bcg from cryptic coatings. on 25th Apr 2018

    5. The only BCG

      Super impressed with Cryptic bolt carrier group I received in mystic black. You can almost just blow on it to clean the residue off of the assembly when done shooting. I think I have pretty much decided these are going to be the only BCG's that I purchase from this point. Karen was a huge help working with me to get one of these ordered. Thanks for the great customer service and product. on 18th Apr 2018

    6. Very Impressed

      This BCG is awesome. The only thing better than the BCG is the customer service. It was very refreshing to deal with them . I can’t thank yall enough. Keep up the great work! on 17th Apr 2018

    7. Nothing but the best!

      Will not fail. on 24th Mar 2018

    8. High quality at a great price!

      I ordered the left handed bcg in the matte black MP/Parkerization finish and couldn’t be happier. It not only looks great but performs great as well. These are the only bolts I’ll use in my new builds going forward. on 16th Mar 2018

    9. Mystic Black!

      This is far and above any Bcg coating on the market. I have tried all of them. Easy to clean and resistant to wear in my 6.5 cm and .224 Valkrie. They handle the high pressure as advertised. Great product! on 14th Mar 2018

    10. .50 Beowulf build

      I purchased your rose gold .556/.223 BCG a while ago for a .50 Beowulf project I had. When I received it you guys gave me mints which was nice (the small things lol). When I assembled my rifle I had no idea how well the carbon build up would come off. And when I mean come off it literally fell off. I've never witnessed something so magical especially with such a large caliber. Granted, I only needed the carrier group but I knew I'd put your bolt in my standard ar15. The bolt for the Beowulf can be purchased at a number of sites, in particular Alexander Arms. To conclude, the group is amazing, makes my rifle pop with a skelotonized receiver set and honestly I'll never go back to a standard set again. Thank you guys so much, I truly appreciate it! on 12th Mar 2018