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. Beautiful Bolt carrier group.

      The look is amazing, even better in person. My friend ordered one as soon as he saw mine. The mystic bronze is just amazing. on 11th Dec 2017

    2. amazing

      havent fired it yet but just handling it and putting it in my upper it feels amazing. the coating feels slick as snot, the machining looks impecable, and all of the "wear zones" look glass smooth. cant wait to use this product. definitely will be ordering more in the future. on 11th Dec 2017

    3. Absolutely awesome coated bolt carrier group.

      This product was exactly what I was looking for. It was sent almost immediately without any extra charges for postage & handling. I'm super impressed with this company (Cryptic Coatings). I selected the mystic gold model & it is of the highest quality. It's incredible how easy it is to clean! I highly recommend any of the products from this company as I'm sure you will be as satisfied beyond belief. on 5th Dec 2017

    4. Beautiful

      The delivery was timely, hassle free and reasonable. When I received my BCG it was more than I imagined. It's perfect. on 5th Dec 2017

    5. Second bcg I’ve ordered

      First bcg I ordered was mystic gold for an ar I built in Alaska. I was hesitant to spend that kind of money but wanted a bcg that would help with using different lubes in the extreme cold as sometimes using regular oil will freeze the bcg up. Have put between 3-4000 rounds through it by now with zero fails sometimes using the bolt without lube. Have not done any full auto dumps or suppressor usages so can’t speak to that. I had looked into other options such as f1’s tin coating. I didn’t need the heat options that mystic black or mystic silver provided because your bcg won’t get that hot even with full auto dumps, I’d used a friends laser thermometer for fun once to see how hot a Nickle boron bcg got and it was never above 130 Fahrenheit. The gas tube was another story. But I don’t believe you could ever dump enough ammo fast enough to cause a heat induced failure in a Bcg. So I’ve been sold on the coating have not used my 2nd bcg yet cuz the build is still in progress but I’m also eyeing one for my .458 socom. on 1st Dec 2017

    6. Simply the best!

      I got the bronze bcg and love it. Over 1,000rds and it still looks flawless. Also wears much less on the upper. Cleans up with a single wipe. These Coatings are unbelievable. Just ordered the light weight for my next build on 24th Nov 2017

    7. CC BCG's for life

      These products are amazing. I started with a Black Nitride, didn't want to chance the reflection of the Mystic Black for a tactical M4. Paired with a Wilson Combat adjustable gas block & internal melonite coated gas tube, trigger, recoil comp, ETC. My Black Nitride has endured insanely heavy engagement & it is as shoots like I bought it yesterday! Like almost every comment on here, I'm buying a second full BCG. Mystic Black Titanium this time. I bet U.S. Army Soldier with an Armalite would swap out for a Cryptic Coatings BCG in a heartbeat. Highly recommended!!!

      P.S. Karen in customer service was wonderful!
      on 20th Nov 2017

    8. Won't use any other BCG

      Getting another Mystic Black for my second AR build. I won't use any other BCGs. on 19th Nov 2017

    9. Best on the market

      Slicker than baby oil on 16th Nov 2017

    10. Black BCG and bolt

      incredibly smooth surface, with a flawless black finish. Gorgeous. Noticeably quieter when sliding inside the receiver. Purchase without reservation. on 14th Nov 2017