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. Best BCG I’ve ever owned

      I love the cryptic coding bolts. I think they’re awesome and well worth the money on 19th Mar 2019

    2. Awesome!!!!

      All I can say is “WOW!!!” I am very impressed with the mystic bronze finish. Fast shipping and great customer service!! Thanks to all for a great product!! I will recommend to everyone that asks “ where did you get that bcg?” on 18th Mar 2019

    3. If your looking for the best this is it!

      I bought my first bcg from from Cryptic coating ( Mystic gold) 2 years ago and many thousand rds later it still looks new. I just purchased my 2nd one last week in Mystic bronze. Without a doubt the best coating on the market bar none. I have ran every coating available the last 18 years and will never run anything other the Cryptic Coatings bcg. Customer service is an A+ and shipping unbelievably fast. Even had 2 mints in the box.. on 11th Mar 2019

    4. What is there to say about this bolt carrier group

      You get what you pay for!!! Which is in my opinion a great product flawless looks better in person than on the picture! Fits right into its resting place inside receiver smoothly. Not only that is at an affordable price! on 7th Mar 2019

    5. The greatest Boat Carrier group ever

      I put a bolt Carrier group from cryptic holdings in my Daniel Defense DDMV11 and never had any problems The customer service is awesome they cater to whatever you need Looking to buy another one for my DDMV7P on 6th Mar 2019

    6. WOW worth every penny paid.

      Purchased one of the Left handed BCG for my AR-15. Took it to the range and wow, after over 60 rounds I took the gun a part and after taking the BCG apart I was amazed that all the parts wiped off with just a rag. I did use some cleaning solvent just to be safe. What I found so exciting was the inside of the BCG group where the bolt makes contact, no powder build up. Not sure but I think the gun cycled faster. I will purchase this again. You will love it. on 27th Feb 2019

    7. very good looking and durable

      200+ rounds later and i love it. very good looking part. very effective. also, the glossy finish gets dusty with gun powder, so you’ll never forget to clean it after extreme use. on 26th Feb 2019

    8. Great product but...

      Awesome BCG looks amazing got mine in mystic black only reason I gave 4 stars is that for how much they charge which in my opinion is a little over priced that they could have thrown some kind of swag gear in with it myself personally would have loved a patch to show what hardware I'm running and unfortunately as much as I want a patch can't see me spending 8$ especially since it took me 6 months to save for the BCG being on a budget and all so other than being slightly disappointed it actually is still an amazing product on 21st Feb 2019

    9. Bronze bcg review.

      So first of all let me say that customer service was outstanding. My bolt came in flawless and smooth as all get out. After about 100 rounds I noticed some of the coating coming off at high impact points at the face of the carrier and corners of the lugs. Now keep in mind any coating will do this so don’t freak out! The bolt was easily cleaned and a little solvent was needed to break down the solidified carbon on the back of the bolt, however, it came off much easier and cleaner than a standard or even nickle bolt carrier would have. Love the product amazing coating and top quality bcg!!! on 19th Feb 2019

    10. Amazing as always

      This is the 3rd bolt carrier I have purchased and it impresses me just as much as the other two. Great craftsmanship and the coatings are perfect. Highly recommend. on 15th Feb 2019