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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    1. 7.62x39 nickel boron

      Awesome ! :-)
      Slid this BCG in an it ran like melted butter...
      on 20th Aug 2018

    2. Mystic Black

      This BCG is a thing of beauty. I haven't had a chance to test it yet as my build is still in progress. on 8th Aug 2018

    3. So far so good

      So far so good. The coating is flawless, looks awesome and its nice and slick. Gas key has good staking, and the bolt matched up perfect with my faxon barrel. I ran about 60 rounds through it so far and it seems to work good. on 3rd Aug 2018

    4. Well Worth It

      I waited to write this until I had the chance to run it through a few hundred rounds. This is slickest, easiest to clean BCG I have ever had. You might be deterred by the price but the quality and uniformity of the coating are exceptional. This blows the nickel boron and nitride finishes out of the water. If I build another rifle this will be the BCG I purchase, may replace the others with this. on 11th Jul 2018

    5. Best BCG's out there.

      These are all I use on every build now. I have never had a single issue with them and the customer service is great. There is no scraping involved when cleaning one of these as the carbon wipes right off. I've tried a lot of high end carriers but Cryptic tops them all. on 9th Jul 2018

    6. Excellent product, look no further

      Aesthetically pleasing, mind blowingly simple to clean, and my father who is in engineering and chemicals was blown away by the workmanship and formula at play here. Will be the only BCG I buy from here on out. High premium is absolutely worth it. on 2nd Jul 2018

    7. Top Shelf

      I purchased a Cryptic Coating complete bolt carrier group. Initial quality was superb and the mystic black coating was smooth as snot. During the range session, the bcg ran flawlessly and felt smooth in my DDm4v11. After 100 rounds, the bolt carrier looked spotless and cleaning was a breeze. My only complaint is a little bit of the coating did chip off near the base of the carrier where it meets the m4 feed ramp. I figured this area would wear over time. on 2nd Jul 2018

    8. Sweet product.

      I ordered this bcg for my first build. It came super fast and even had some goodies inside. (Decal and lens wipe both with the cryptic emblem. And some mints) The bolt functions flawlessly and works very well. Very happy with it. I would definitely do business with them in the future. on 29th Jun 2018

    9. ToolCraft and Cryptic only!

      This is my first mystic black and I am amazed at the finish and how well it cleans up! I have used many of your QPQ finished BCGs and this was by far the most costly, but I am never disappointed! on 25th Jun 2018


      We are an advanced firearm manufacturer and have tested all
      The best bolts. There is nothing better than Cryptic! World class customer service, lightning fast Shipping and the very best quality and aesthetics. Thank you guys so much for all you do!
      on 22nd Jun 2018