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. Slick

      As I noted other people saying, this bcg is absolute perfection. I am still waiting for the scope to arrive but hopefully in the next few days I will see how well it operates. It's probably the high point of my latest build. I topped it off with a POF tomahawk and love the feel. on 14th Oct 2019

    2. Looks incredible

      Haven’t been able to take it out yet, but this is easily the highest quality BCG I have ever purchased as far as fit and finish. on 14th Oct 2019

    3. Great Company

      I just had my first experience with Cryptic, it was great, I got the part sooner than I expected, the packaging was very nice, and the bcg I ordered was even nicer. The part works and looks great, I will be doing a lot more business with these guys. on 26th Sep 2019

    4. Awesome finish and material

      It's a toolcraft bolt. Beats out my bcm and my standard bcg by miles. I need to do a comparison with my lantac bolt but so far its held up to everything. Easy to clean easy to polish and it adds that bit of X-factor to my build that makes it more unique. Will definitely buy more. on 12th Aug 2019

    5. Perfect

      Flawless polish on all components. Haven't installed it yet but it's gonna be hard for dirt to stick to this. Looking forward to using such an excellent product. on 9th Aug 2019

    6. Super product

      I think you put out an excellent bolt carrier group, but I am exceptionally pleased with the way you do business. on 1st Aug 2019

    7. Mystic Blue BCG

      Simply Awesome! Worth every penny. Will be buying more. on 22nd Jul 2019

    8. 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

    9. 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

    10. 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