Cryptic Coatings 5.56 NATO AR-15 Bolt Carrier Group - Mystic Black

Manufactured by Cryptic Coatings
SKU: CC-0100
MPN: CC-0100
Manufactured by Cryptic Coatings
5 Reviews

Out of Stock

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Founded in January 2014, Cryptic Coatings specializes in bolt carrier groups and BCG coatings. With an ever-expanding product line, their BCGs and coatings offer reduced friction, longer lifespans, and increased performance, backed by their lifetime warranty.

This Bolt Carrier Group includes a MIL-SPEC 8620 aircraft quality steel carrier with a shot peened carpenter no. 158 steel bolt. The M16 cut carrier is compatible with most AR-15s on the market and features a shrouded firing pin, a chrome lined interior, and a properly staked, chrome lined gas key secured with grade 8 fasteners. The bolt assembly includes a tool steel extractor with spring and Viton O-ring. A chrome finished firing pin is also included.

Cryptic BCGs are finished in one of six different coatings, each offering reduced friction, increased performance, and greater wear resistance than that of a standard bolt carrier group.

  • Mystic Black - 5.56 NATO
  • Chemical vapor deposition coating
  • Coefficient of friction: 0.01
  • Hardness: 3000 Vickers
  • Maximum temperature: 1,000 degrees Fahrenheit 
  • M16 cut bolt carrier
  • High pressure tested
  • Magnetic particle inspected
  • 8620 aircraft quality steel carrier
  • Heat treated to 60-61 RC
  • Chrome lined carrier interior
  • Chrome lined gas key
  • Gas key staked with grade 8 screws
  • Carpenter 158 steel bolt
  • Tool steel extractor
  • Viton O-ring
  • Chrome finish firing pin
  • MIL-SPEC cam pin
  • Weight: 11.55 oz
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Bolt FinishChemical Vapor Deposition
Bolt MaterialCarpenter 158 Steel
BrandCryptic Coatings
Caliber Gauge5.56 NATO
Carrier FinishAmorphous Carbon CVD
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected
Weight11.55 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

5 reviews

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Pricey but worth it


I purchased a blemish black mystic bcg from cryptic coatings a few months ago (not from primary arms) and although these are a little pricey they are top notch. The coating is way slicker than nickel boron and so far i have no wear marks/points on the bcg.

It's not snake oil

by -

I love mine. I can clean off all the carbon with a dry paper towel. This thing is sweet, and it almost slipped out of my hand the first time I picked it up. It's super slick and works flawlessly.

Great BCG and Cryptic CS is top notch

by -

This is the slickest bolt I have ever felt and I have run nickel boron, chrome, black nitrite, and phosphate. It is pricey but is very simple to clean and putting one drop of lube on this makes it feel like it is soaked. I almost gave it four stars but due to Cryptic Coatings customer service, decided to still give it 5. After 170 rounds, the cam pin showed excessive wear. I sent them a picture and they said that is the first time they have seen that and they had a new cam pin sent out the same day. With that said, you can't go wrong with this BCG.

Best bolt carrier ever made


If you are putting anything else in your 5.56 AR you are making a mistake. This is the best BCG period.

Subpar Staking

by -

I ordered 3 of these, and the staking appears off centered an innefective as it concerns being able to prevent screws from eventually backing out of the gas key. I can share pics, if anybody is interested in seeing or correcting the issue.

Thank you for taking the time to speak with us, We look forward to serving you in the future.