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 out 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 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. One of the best Upgrades for any AR style rifle

      I have these in all my AR style rifles (2-5.56, .308, 300 AAC) and they are fantastic. They not only operate flawlessly, but they are incredibly easy to clean. If you shoot a large volume of rounds and/or suppressed, they make the whole session more enjoyable. on 15th Aug 2017

    2. Mystic Black

      The pictures of these BCGs are awesome but don't even compare to when you have one peeking out of your dust cover. Couldn't be happier. on 12th Aug 2017

    3. Great Bolt Carrier

      I received the BCG in record time. I can't find anything wrong with this BCG. Unless its not as bright as the good one's. But the savings are great. I will be picking up more of these down the road for other builds. Love it. on 8th Aug 2017

    4. Super Slick

      I ordered a blemished Mystic Black BCG to use in a 10.3" 5.56 pistol. I can't find the blemish at all. Now that I have made a few trips to the range with it I'm sold. I use Slips 2000 and wipe down the moving parts every 250-300 rounds. Sometimes I put the gun away for several days before cleaning. Even then a dry paper towel will wipe away all of the carbon to include the normally stuborn bits on the tail of the bolt. Even dry the BCG is slick to the touch. It really feels like it has a coat of oil on it at all times. When I reassemble I add a few drops of oil on the friction rails and the bolt itself and do it all again. I haven't had any need to scrub any parts at all over the course of 1200ish rounds. I'm not really a fancy coating kind of guy but this one is really cool. on 13th Jul 2017

    5. Great product

      This is my second "blemished" unit, although I still can't find what exactly about it is blemished. I was lucky to get it with the additional July 4 sale, so it was almost $75 off the regular/unblemished product price. Overall great value (in line with the price point of a good nickel boron BCG). Super easy to clean. I have 3 of them in total and couldn't be happier. 1 is running in a custom 223/556 build, and the other 2 in custom 300 blk builds. Headspacing is fine with all 3 of my barrels including 2 odin works barrels and 1 KAK 300 "Mr. Blonde" barrel. on 11th Jul 2017

    6. This cant be a blemished unit

      This BCG from Cryptic Coating is flawless for a blemished unit and it fits my upper with no modifications and works great. I've only put a few rounds down range with this BCG and showing no wear and not expecting any, Thank You Cryptic Coatings for a superior product. on 11th Jul 2017

    7. Exactly what I hoped for...

      This is the final component to a .300 Blackout build that I started at the beginning of the year and I couldn't be more pleased. Not only is it exactly as described, it is actually better. Having done finishing work for many decades, I truly cannot find a blemish on this piece. Kudos to you guys for a product line that is exceptional and a company that still values integrity. on 7th Jul 2017

    8. Amazing

      Blemished mystic Black BCG- I don't know how they can sell it as blemished, because it looks and runs perfectly! Amazing product, this is my third one, I will only use cryptic bcgs. on 3rd Jul 2017

    9. Overly impressed!!

      Ive been shooting AR platform rifles for 10 years and I am very impressed with this BCG!!! Used many makes, models, gas impingement and gas piston systems with varying results. I can hands down say this is the best upgrade you can do for your AR if thats all you decide to do.

      It is being used with a ghost firearms upper reciever and juggernaut tactical lower. I tried .223 55grain reloads with only a couple failure to return to full battery(common). Second was federal m193 5.56 100 rounds with not one failure, including a 30 round mag dump. Third was american eagle 62grain fmj 5.56 with excellent results!

      Blemish? What blemish, I cannot see any blems on this it appears flawless to me thanks guys for the 15% off. My business will go all to you for future BCG needs, along with all my friends too!!
      on 28th Jun 2017

    10. SLICK AS BUTTER, Great BCG'S

      Once again came back and bought 2 more BCG'S 556 300 one Mystic black and one gold yeah yeah I know I said I wouldn't buy mystic black again but I did.... both blemish and both in great condition can only find very very minut small if any imperfections. Still waiting on those promo codes or discounts is my only complaint. As I have bought 8 bcg's now two 308 six 556 300. Very nice staff and will call if you leave message about availability. KAREN you can email me my promo code or just call and give it to me. ; ) on 27th Jun 2017