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. quit reading reviews and just buy it

      Outstanding fit and finish but more importantly FUNCTION! Installed Cryptic silver BCG in a rifle which was acting undergassed with a parkerized BCG. Shortstroking immedetiately went away and bolt locked back on an empty magazine every time. Casings eject to 3:30-4:00 and would all land in a five gallon bucket. clean up is a snap as carbon just does not stick to this coating. Could not find any blem (maybe a few tool marks on the i.d. in the rear of bcg that effects nothing). shipping was very fast and packaging was great. Cryptic coatings just added another very satisfied customer
      on 3rd Jun 2018

    2. Awesome Product

      I bought a blemished BCG could not find any visible blemishes. Works like a charm I would highly recommend this awesome BCG money well spent. on 2nd Jun 2018

    3. i didn't notice the blem spot

      thank you very much very well packing excellent coating fast shipping for sure i will come back again on 31st May 2018

    4. Can’t tell it’s blemished

      As all the other reviews stated, I too took a chance on a blemished BCG in mystic black for my aero 308 build. Arrived quick and packaged perfectly. Broke the bolt down and still could not find the blemish. Worth every penny, 100 rounds through it this past weekend and wiped the bolt clean no problem. Looking forward to doing business again in the near future! on 30th May 2018

    5. High Quality and Affordable

      The bolt carrier had some scuffs on the nitriding but that's to be expected with a blemished model. The bolt itself looks flawless and headspaced without an issue. You get a high pressure tested and MPI bolt at a great price. on 4th May 2018

    6. Exceptional BCG

      I received this request long before I got to try bolt carrier and as it turns out like everyone else said. It worked perfectly it looks cool cleaning it was a cinch. I bought the blemished and could not find any flaws....Good Job CRYPTIC COATINGS......Paul on 17th Apr 2018

    7. Great Overall Producs

      I bought 4 blemished and 1 new over the years for my rifles. I cannot tell a difference between them. All of them have functioned flawlessly, and I haven’t broken anything after about 3k rounds. Most of these were with a suppressor as well.

      Cleaning is a breeze. You can literally just wipe it down and it’s good as new. I haven’t experienced carbon buildup that I had to scrape from the bolt other than wiping it.

      They sure are pricey, but well worth it if you are lazy and want a good quality product.
      on 26th Mar 2018

    8. Wow!

      After reading the reviews I ordered a blemished BCG in Mystic Silver and all I can say is wow! I don't know where the blemish is, but there must be one somewhere. I used this in a 300 Blackout build with a skeletonized upper and the silver BCG, along with a stainless steel barrel, really makes this pistol stand out. The BCG preformed flawlessly from the first round and I plan on ordering a gold one for my next project. You will not be disappointed! on 22nd Mar 2018

    9. Blemished

      I honestly did not see any blemishes. I shot roughly 150 rounds through it, took it apart to clean it, and found a spot that the carbon didn't immediately wipe clean from. Im assuming that's the blemished spot, it's tiny, and i don't care. These guys build awesome stuff. on 20th Mar 2018

    10. Mystic Black "Blemished" beauty

      Took the chance on a blemished model due to all the positive reviews. Like other reviewers I couldn't have been happier and I honestly can't find a blemish. These Cryptic Coating BCGs are literally gun porn. I love everything about it, even being "blemished" and the blemished price difference, these are gorgeous as well as having a pretty sweet logo. CC is and will be my go to BCG supplier from now on and that sexy Rose Gold (mystic bronze) is my next purchase for my next build. If you're looking for real reviews to decide, You won't be disappointed with a blem purchase or any other BCG from CC. on 19th Mar 2018