Coated Bolt Carrier Group

Coated Bolt Carrier Group - BLEMISHED

Take advantage of our attention to detail.... 15% off in fact. These blemished bolt carrier groups didn't meet our expectation therefore we are passing some savings on to our customers.

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The fit and function is 100% true to our normal bolt carrier groups, these simply just have some minor cosmetic blemishes. They also carry the same lifetime warranty for form, fit and function as our non-blemished BCG's.

15% off has already been applied to the pricing on this page.

Blemishes may include one or some of the following:

  • Poor logo marking, or missing logo.
  • Imperfect polishing, contained mostly on the inside of the carrier, causing a non mirror-like finish.



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. Amazing products!

      You can’t ask for a better product! By far the best BCG I have ever used. on 23rd Nov 2020

    2. I'm sorry, but I can't find the blemish.

      I've tried. I haven't torn down the BCG yet to search every coated component, but a through exam prior to disassembly has failed to find a single visible blemish anywhere.

      I bought the .308/7.62 BCG in Mystic Black, and it's gorgeous. I love this BCG, and am replacing my original BCG with it. See my review under the .223 (unblemished) for more verbage.

      I very much love these BCGs, and will probably only use them going forward.
      on 14th Oct 2020

    3. Beautiful Burnt Bronze

      I feel extremely lucky buying a blemished burnt bronze BCG because I cannot find a blem or flaw on it at all. It looks perfect and stands out in my gun exactly how I wanted. My only regret is that I didn't buy a few more when I had the chance. on 7th Oct 2020

    4. Literally perfect - literally is an overused word but this time, its accurate.

      I purchased the Mystic Bronze to go with a burnt bronze cerakote gun I'm putting together piece by piece, I've had my eyes on the cryptic coating BCG's for a while and glad I finally pulled the trigger, pun intended. While this was sold as a BLEM, I looked and looked and looked some more and couldn't find a BLEM anywhere on this beautiful BCG - trust these reviews, this BCG is LITERALLY perfect. on 1st Oct 2020

    5. Cryptic gold bolt carrier

      I purchased a 'blemished" 308 bolt carrier, hsve not neen able to find the area that is blemished. The surface of the bolt and bolt carrier is extremely smooth, have not fired it yet. I am satified with my purchase. on 21st Sep 2020

    6. Perfection.

      I purchased a blem mystic gold. Still cant find a blemish anywhere. It a great focus point to my rasta themed Ar15 build on 24th Aug 2020

    7. Great.

      I ordered 2 BCG's one in a .223 and the other in 6.5. The order shipped quick and without hassle. The .223 works like a dream, but haven't got to try out the 6.5 yet. Both BCG'S were worth every cent. I will definitely be using cryptic for my next build. on 24th Aug 2020

    8. Glad the QC inspector needs glasses! Perfect item!

      I couldn’t find a blemish on this thing- but I am glad they allowed me purchase it as a blemish!!!! I love to save money on quality products. It looks absolutely perfect, this is my third BCG from cryptic coatings and I couldn’t be happier. on 17th Aug 2020

    9. Slickest BCG on the market!!!!

      If you haven't tried a Cryptics Coatings BCG then you're missing out. I've had many different BCGs from big name companies and this is by far the best one I've ever owned. ALSO THE CUSTOMER SERVICE IS TOP NOTCH. CALLED AND SPOKE WITH SUMMER ON SEVERAL OCCASIONS AND SHE WAS EXTREMELY PROFESSIONAL AND SHE WENT ABOVE AND BEYOND TO HELP ME OUT AND ENSURE I GOT WHAT I NEEDED. I can't say enough great things about this company and their products. They are now my only choice for a BCG on any platform I build. on 14th Aug 2020

    10. Blemished?

      First if I’d like to say extremely fast shipping. Ordered a blemished.308 BCG at 12:30 am was sent out same day by 6:00am. As for the blemish what blemish lol this thing looks Immaculate. I will most definitely be ordering from Cryptic Coatings again on 12th Aug 2020