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. Beautiful BCG

      These BCG’s are amazing, they are so slick oil has a hard time staying on them. The fit and finish is amazing and the function is flawless. on 15th Jul 2019

    2. Can't Say Enough Good Things

      I now own several Cryptic bcgs as well as a couple of spare bolts. Mine see use in .308, 6.5 Creedmoor, 6.5 Grendel Type II, .223, .224 Valkyrie and .22 Nosler. Not a headspace issue or stumble in the bunch. They are expensive though well worth the price. I won't do another upscale build without one. They don't improve accuracy but do take one potential element of malfunction off the list. Fit and finish is the best out there, cleaning is as simple as wiping them down and yes I do lube them even though they are super slick. Which brings me around to the business model. Service is superb with very fast shipping, secure packaging and extra touches that make you feel like a valued buyer. When it's not in stock they don't hold you up for weeks+ or send you something you forgot about 4 months down the road. Awesome job kids. on 11th Jul 2019

    3. Perfection

      First off the machining is above superb, flawless even. Mystic Black is slick as anything right out of the box, and looks amazing. Headspaced perfect and functioned top notch. You cannot buy a better BCG. Thanks Cryptic for a great product and love the sticker.
      on 8th Jul 2019

    4. Beautiful

      Pricey, but worth it. on 4th Jul 2019

    5. Better than expected

      I have high expectations but this definitely exceeded them. Great product, customer service and fast shipping. Look forward to getting more! on 4th Jun 2019

    6. Really impressive upgrade

      Purchased the mystic black bolt carrier group. This coating is the best I’ve seen. At the very least, the ease of cleanup is worth the price in my opinion. You can run 1000 rounds and wipe it off with a paper towel. It will be completely clean and like new. Reliability has been 100%. Ran 1000 rounds without any cleaning and no issues at all. If there was heavy fowling and dirt in the action this thing would still run I believe. Would be a fantastic bcg for a suppressed rifle. on 21st May 2019

    7. Really great bcgs!

      I've bought 2 of these, one mystic black and one mystic gold, and they are my favorite bcgs of all. The packaging of them was top notch, and when you open them up it's always so impressive how perfect and slick they are. I've put about 3000 rounds thru the mystic black and not a single failure. Clean up is so easy as well. I thought they were priced a bit high at first , but after having owned just one, I knew that cryptic would be the only place I'd be buying my BCGs from. I'm sold on this company, fast delivery, great product. I still get a kick out of people at the range commenting on how "badass" this bolt carrier is! Can't go wrong on these in my opinion. on 14th May 2019

    8. Smooth as glass

      I have to say I am always impressed with the consistent quality of these bolts. These are hands down the best quality bolt carrier groups on the market. The finish is smooth as glass and so slick there aren’t words to describe them. The attention to detail from start to finish even down to the shipping. They even throw in a couple treats and a soft cloth and some cryptic swag. You’ve got a customer for life. Keep up the good work. on 13th May 2019

    9. Mystic Bronze

      When I opened it, I thought I was going to drop it. This bad boy is SMOOTH. Very nice, no problems at all. More of a rose gold color. It's a great color! on 30th Apr 2019

    10. Great BCG

      This is my second Black Nitride BCG from cryptic haven't had a issue yet. The finish and polish on the carrier is well done no tooling marks ext.. Its slick and is easy to clean. No complaints at all just wish i could afford on of their Mystic Blacks ones. on 11th Apr 2019