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. Hands down best BCG you can buy.

      If I could give this 10 stars I would! Far superior than any other BCG I have felt or shot. Fires flawlessly and can basically be cleaned by the wipe of a towel. So impressed I’m about to order another 9mm BCG. on 10th Aug 2020

    2. Great Company, Great Products

      I started buying from Cryptic back in 2014 when they were a relatively new company. The original gold BCG in my BCM has seen about 10k rounds (some full auto) and I’ve replaced the gas rings twice. It still runs flawlessly and is crazy easy to clean. The bronze BCG in my Aero Precision 308 also runs like a top, as does the silver lefty BCG in my stag upper. These really are the best coatings on the market. Also super fast shipping every single time - on my most recent build they were the first company to send me a shipment notification at 6:15am the next morning. Very impressive. on 4th Aug 2020

    3. Quality

      Incredible coating. It is as slick as they say. on 4th Aug 2020

    4. Stunning finish, Completed my 'Olympic Set' Mystic Gold Silver and Bronze

      The look and feel of these bcg's are top-notch.
      Have not tried using them yet, but have no doubts that they will perform as good as they look.
      on 19th Jul 2020

    5. Slick, Bright and Shiny

      I have had my eyes on Cryptic for a few years but never pulled the trigger. Decided to get a Mystic Gold because...... reasons, you don’t know my life! To say the BCG was shiny and slick as snot would be an understatement. At first,I thought it was coated in oil but realized it was just the coating. It was a breeze to clean and the tolerances are tight and smooth, the cam pin fit is perfect. It ran like a scalded dog and fed everything I threw at it. Ordering a Mystic Black today and can’t wait to put it in one of my other builds. on 17th Jul 2020

    6. Only ones I run

      Best BCG out there. Used several kinds and always come back to cryptic. Never an issue and they run in whatever I put em in and whatever I feed em. Great product. on 15th Jul 2020

    7. Just buy one!

      I have 5 now. The oldest is 4 years old and still looks new after at least 6 thousand rounds. Pull the trigger and buy one, you won't be disappointed! on 14th Jul 2020

    8. A product you won’t regret buying

      This is my 2nd BCG from cryptic. I was hesitant at first, but I’m so glad I pulled the trigger the first time.

      These BCGs cycle so well due to the lubricity of the coating and they clean extremely easy. They bead off water like a well waxed car and they soak up oil like a sponge. I am building my second AR and the first purchase I made was the CC Mystic Black BCG.

      Just a sidenote. If you’re going to suppress your rifle, I would opt to get the standard BCG and NOT the titanium. I bought the titanium and it’s amazing! However, the increased gas coming back through the gas tube and lightweight of the titanium BCG causes the rifle to be over gassed (even when using a Superlative Arms bleed off style gas block fully open) unless you run a H3 buffer which Defeats the purpose of a lightweight build.

      Long story short. GREAT PRODUCT. Buy the Titanium BCG if you’re shooting unsuppressed and want a lightweight build with minimal recoil. IF YOUR RUNNING suppressed, buy the standard weight BCG
      on 10th Jul 2020

    9. Incredible

      Best BCG I have ever owned. on 8th Jul 2020

    10. Only BCG‘S I’ll ever buy

      Bought one for my 300blk pistol, it literally is slicker than snot, flawless in every aspect, ordered 2nd one for 5.56 pistol, same deal, absolutely flawless, these BCG’s work and are everything they claim to be on 1st Jul 2020