Coated Bolt Carrier Group

Coated Bolt Carrier Group

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Now available in Black Nitride!

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 insures 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. All gold everything!

      I went to order the mystic gold 5.56 BCG, said it was unavailable. I sent an email to crypic and they got back to me quick, told me that they'll contact me as soon as it becomes available again, next day it was available! I ordered that bad boy and although the weekend interfered with a retardedly fast delivery, it was still here pretty quick(3-4 days) I'm very pleased with this product and will do business with them again in the future, although I doubt I'll have to ever buy another bolt, unless i decide I want another AR...but if I do, I'll be back for another one here. on 20th May 2017

    2. beautiful finish!!

      this thing is a work of art on 19th May 2017

    3. Best Bcg out

      Love this bcg gotten the mystic gold in the past now I've got the bronze and it won't be the last one I buy thanks again for a great product on 17th May 2017

    4. perfect!

      beautiful product! fast delivery! on 16th May 2017

    5. Lives up to reputation

      Great product, even better company. Great, interpersonal service and fast delivery.

      The mystic black titainium bcg is hands down the best combination of smooth cycling, easy to clean, and most importantly functions reliably 100% of the time.
      on 11th May 2017

    6. Awesome

      Fastest shipping around, 2 days. I got the NiB and its superior to other NiBs out there. Smooth as butter, nicer shiny coating and viscosity than other products.

      Moderate price range for quality.
      on 2nd May 2017

    7. Mystic Magic!

      Mystic Black (.223) has such a durable coating, impressive! The toolcraft bolt carrier assembly is very well made. Ran 1000+ rounds before this review, no sign of wear yet. I use weapon shield for lubrication and I can see the coating lasting a long time. I now want a .308 but it seems that Cryptic can't keep up with the demands, lol! Waiting for the next run to be available. :) on 1st May 2017

    8. Nitride BCG's

      Recently purchased the referenced BCG's in .223 and .308. Bothe are well made and operate smoothly. They perform as advertised, I recommend trying Cryptic, you won't be disappointed. on 17th Apr 2017

    9. Awesome Product!

      This thing runs smooth! The gun I got was those pre-made guns, and the bcg was failing on me so I started upgrading parts. The first part I upgraded was the BCG from Cryptic Coating. I got the mystic black, and WOW! So Smooth! What a difference. Cleaning it was very easy too! So far I have put about 2.3k rounds through the bcg and it still runs like when I first got it, after cleaning of course. I would totally recommend this bcg to anyone who is looking to upgrade. on 14th Apr 2017


      Cryptic's bolt carrier groups are the best in the industry! Top notch quality, Top notch shipping, and Top notch Customer Service! on 13th Apr 2017