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. Simply The Best! My ONLY Choice for Bolt Carriers

      This my second Cryptic Coatings BCG and as with my first Cryptic Coatings BCG I'm extremely pleased with its quality, smooth operation, and ease of cleaning (micro-fiber cloth is usually all it takes - and they supply the micro-fiber cloth). Cryptic Coatings is first class and a by far have the best product out there. on 22nd Jan 2019

    2. Outstanding, Well Built and Super Slick!

      This BCG is by far the most superior setup compared to anything else on the market. Zero issues with durability or reliability at with 2k+ rounds on it. Cleans up with a microfiber towel for the most part, might need a brush around the rings for the stubborn build up. Will continue to upgrade all of my setups to include Cryptic Coatings BCG's. on 28th Dec 2018

    3. My favourite bolt carrier period.

      Here's the bottom line period. I love to build and shoot AR platform rifles. I don't like to clean them though. So, I buy the nitrided carriers and run them until they fail before cleaning them. I have at least 3 right now on 3 different rifles. Haven't cleaned one of my AR's for probably 2 years. Won't even consider buying a different carrier. on 16th Dec 2018

    4. Top Of The Line Products!

      Have been buying Coated BCGs from Cryptic for years...have them in all my guns in Various Coatings...Wipe clean every time! Highly Recommend! on 29th Nov 2018

    5. Great BCG

      IMO one of the best BCG’s available. This is my third purchase and I will only run this in my builds. Not only is the coating smooth and slick but hands down the easiest piece of my gun to clean after a day at the range!! Buy one, you won’t regret or be disappointed. on 29th Nov 2018

    6. Slicker Than Owl Poop!

      First, a bit about my background. I am a rifle armorer for a PD of 285 officers. A little over a year ago, an officer brought in his patrol rifle for inspection, a Daniel Defense sporting a Cryptic BCG. Of course I was impressed with the DD rifle, but what really caught my attention was the shiny and slick Cryptic BCG. I see a lot of rifles and BCG's. But this one was the slickest and smoothest I have ever seen. Even w/no or very little lube. Ha! I said "lube". I vowed to save my pennies and one day purchase a Cryptic BCG. I signed up on the Cryptic website and waited for an discount code email. And waited. And waited. And waited. Sadly, it never came. I finally lost it and asked about a LE discount. And that is the story of how the Stork delivered my first Cryptic BCG. She was Mystic Black. Not a flaw on her body. I lightly touched and caressed every part of her as I gazed upon her shiny skin. Wait, what was I talking about? Then I inserted her...into my rifle, you perv! Talk about a smooth action. I really don't see how a BCG could be any smoother. My other rifles quickly became jealous. So in the interest of a ménage à trois, I purchased a second in Mystic Blue. My poor Nickel Boron (from another company) now keeps getting pushed back in my rifle collection. I sorta feel sorry for her. So, I am a satisfied Cryptic customer. I am a return customer. I recommend them to anyone who has the extra coin to cough up for what is probably the finest BCG out there. Still reading? Yes, they work flawlessly. They are easy to clean. So go ahead. Pull the trigger. No regrets here. And as always, Rock On! on 28th Nov 2018

    7. Quality

      Have not fired using this Bcg yet. It came quick and the quality is next to none. on 17th Sep 2018

    8. Best BCG Ever

      Amazing BCG. Works flawlessly and super easy to clean. Would highly recommend the Bronze BCG. on 13th Sep 2018

    9. Well worth the money.

      If you are shooting suppressed or simply don't clean your gun to often and let the powder build up, this is the bcg for you. It is slick and super easy to clean. Its as easy as just wiping off no matter if it seen 10 rounds or 1000 rounds. I have the bronze as well as the mystic black both are awesome. on 11th Sep 2018

    10. flawless

      awesome bcg PSA upper 7.5 inch barrel with binary trigger 100 rounds ran perfect an still clean when it was all over on 3rd Sep 2018