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. Extremely slick and shiny BCG

      I ordered the mystic bronze coated BCG and was impressed enough to order a second one in mystic blue. The blemish on mine was a very small, minor rough spot in the coating along the top edge of the hollow section, above the forward assist serrations. This part doesn't contact the receiver, and the blemish doesn't affect performance in any way, so 5 stars from me. on 4th Dec 2019

    2. Blemished 7.62 bolt carrier looks flawless

      I bought my blemished Mystic Black large AR bolt carrier figuring it would have the slick coating and was OK with cosmetic flaws. It is absolutely flawless and I could not find the blemishes. on 4th Dec 2019

    3. Great BCG

      Second bolt carrier group I’ve purchased from cryptic... love them ... not sure why they are marked as blemished... easy to clean... fast running on 3rd Dec 2019

    4. Great products

      Fantastic products that really hold up. Purchased my first CC bcg a few years back for my sbr. It has around 15k rounds of dirty 300blk thru it and still works great. Besides all the great quality's of their bcg's just the ease of cleaning them is worth it. I have purchased several more for other applications (blems and non blems) and it's about the only bcg I use now. on 3rd Oct 2019

    5. Amazing coatings

      Recently picked up a bolt carrier group in mystic gold and was blown away by not only how good it looked but how well it performs. Highly recommend getting one for anyone who can afford these! on 10th Sep 2019

    6. Excellent product quality!

      This is my second cryptic coatings bcg, 1st blem, and the quality is exceptional. I can not locate the blem anywhere. The reduced coefficient of friction compared to nickel boron is significant. The “blue” aspect of the color is very subdued, and adds a nice complement to the tungsten cerakote on my rifle. The minimal amount of lube necessary with these coatings more than offsets the increase price. Would definitely buy again without hesitation. on 3rd Sep 2019

    7. Blemished?

      Decided to combine a sale with one of Cryptic Coatings blemished products to get a pretty good deal compared to the full priced bcgs. All I can say is "WOW". The blemish is just cosmetic, as the say, and function is phenomenal. Now that I've tested the waters, I am sold for any future projects (and past ones). The question is, "Are they worth the steep price charged?". Absolutely, probably. Idk, I like mine. KY Jelly has nothing on this coating. on 1st Jul 2019

    8. Amazing Value

      Just got my second Cryptic blem and still can't find what's wrong. I ordered the blue this time just for aesthetics and was a little surprised when I opened the package. The blue isn't the light gray blue in the picture but rather a midnight blue that looks black under artificial litght. Maybe that was the blem but I like it. These bcgs are my new goto. Solid, slick, uniform build and slick and did I mention slick.
      My only wish so far is that the .308/6.5 Creedmoor bolts were offered in the high pressure versions with reduced diameter firing pin tip as made by JP and Fulton.
      On top of everything else these folks are great to deal with. Like making new friends.
      on 25th Jun 2019

    9. amazing product

      when received in the mail , your in awe at the product . you cannot see the "blemish" anywhere . for the money you save , id buy blemished all day long. thank you again for a great product . on 15th Jun 2019

    10. Almost thought they sent me a new one.

      Ordered a blem BCG and took two of us searching with bright lights to find what we thought may have been blems. To be honest I feel like it is as good as new. Love the customer support and delivery times. on 5th Jun 2019