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. The last BCG you'll need.

      This will be my 3rd CC BCG. I've been looking at all these BCGs with "improved ergos" and I just don't see why people keep trying to reinvent the wheel. Just a solution looking for a problem in my opinion. These are Toolcraft BCGs which are tried and true and the Cryptic Coating is absolutely amazing! This is my first "blemished" one but all the BCGs I run are Cryptic black. Never had an issue and I can't put into words how slick this BCG is. In my mind, it'll minimize rubbing wear in my upper and know I can trust my rifle to still fire no matter how dirty it gets. The finish has held up amazingly and it looks brand new every time I clean it. If you're like me and clean after every range trip, you can trust your life to this BCG. Don't settle for these other manufacturers or be a guinea pig for these new BCG designs in your fighting rifle. on 3rd Dec 2018

    2. Awesome product!!

      This would be the 3rd bcg from cryptic, but the 2nd gen dpms AR10 bcg is smaller so cryptic's won't fit. on 11th Nov 2018

    3. Where's the blemish?

      I ordered the blemished bronze bolt carrier group and wow is it slick and pretty. I can't find the so-called blemish on this beauty either.
      Took it out shooting in my 8" 300 blackout pistol and got it nice and dirty. This thing wiped clean with a dry microfiber cloth. So easy I couldn't believe it. It was still a bit discolored on the bolt tail so I gave it a couple sprays of your standard gun cleaner, let it sit for 5 minutes and shazam, looks good as new! I'm a perfectionist when it comes to cleaning my guns and this BCG is the perfect solution to that perfectionism, saved me some serious time. Two thumbs up, 5 stars!
      on 20th Aug 2018

    4. Outstanding

      Like others who purchased this BCG, I couldn't find the blemish. Beautiful, slippery finish. Cleans like a dream. I'm interested to see how it holds up over several thousand rounds. Definitely worth the investment. I'll be back. on 7th Aug 2018

    5. Amazing BCG

      This company does not play!!! These things are amazing. Besides looking GREAT ,they are so slippery I can barely hold on to it. This is the only BCG company I’ll EVER spend money on, hands down. I will be buying the black one for my Daniel Defense. KEEP UP THE AMAZING WORK! on 13th Jun 2018

    6. 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

    7. 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

    8. 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

    9. 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

    10. 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