FailZero EXO Coated 7.62x39mm AR-15 Bolt Carrier Group

Manufactured by Fail Zero
SKU: FZ-7.62X39-01-NH
MPN: FZ-7.62X39-01-NH
Manufactured by Fail Zero
10 Reviews
Add to cart for sale price $144.99 $189.99

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This 7.62x39mm Bolt Carrier Group is fully assembled and drop-in ready for most MIL-SPEC upper receivers. All critical parts are coated with EXO Nickel Boron technology providing permanent dry lubricity, extreme durability and increased wear and corrosion resistance. This patented Nickel Boron coating will reduce friction and improve the overall performance of your rifle.

NOTE: In spite of the included Enhanced Firing Pin, light strikes may still occur when shooting TulAmmo or Golden Tiger ammunition due to excessive primer depth.

  • 7.62x39mm compatible
  • MIL-SPEC length bolt 
  • M16 cut bolt carrier
  • Black Rifle Arms Enhanced Firing Pin 
  • Magnetic particle inspected
  • Live fire tested
  • EXO Nickel Boron treated parts include:
  • Bolt, extractor, bolt carrier, cam pin, and carrier key

Includes a reliable MIL-SPEC length bolt and a longer length Black Rifle Arms Enhanced Firing Pin for better performance without over penetration. The extractor includes a heavy spring, silicone insert, and O-ring for improved extraction tension. Not all Nickel Boron is created equal and FailZero is the undisputed pioneer of Nickel Boron technology. When failure is not an option, you can depend on FailZero.
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Bolt FinishNickel Boron
Bolt MaterialCarpenter 158 Steel
BrandFail Zero
Caliber Gauge7.62X39mm
Carrier FinishNickel Boron
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedLive Fire Tested
Magnetic Particle InspectMagnetic Particle Inspected
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

10 reviews

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Pretty good.

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great quality, havent cleaned yet. ran very well. decent price

Fail Zero rules!


I have a Fail Zero BCG at the heart of my .458 socom build and I couldn’t be happier. I’ve not had a single malfunction with it. In my haste to shoot it, I forgot to lube it and the upper receiver. Functioned flawlessly, I’m completely satisfied.

Great for 7.62x39 uppers.

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I have built 4 7.62x39 uppers with this BCG with 100% reliability through thousands of rounds of steel cased Russian ammo. This is the only BCG I will use for my x39 builds. Excellent product!

FZ 7.62x39 BCG

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Purchased "on sale" - super value for an exceptional NiB bolt carrier group. A drop-in BCG that runs steel or brass out of my 10.5" 7.62x39 pistol. And, the best part is Primary Arms FAST shipping. The best in the business !!

FailZero 7.62x39 BCG

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This is my second FailZero 7.62x39 BCG. Unsurpassed quality with NiB, enhanced to the max. Great value. Highly recommended.

bolt carrier

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well made. at a good price.

Awesome BCG

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This bolt Carrier group works excellent with steel cased and brass 7.62x39.

Awesome product

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Very pleased with the fail zero BCG

Finally its reliable


I have a radical firearms upper, that has never let me shoot steel casings reliably. I've upgraded to the enhanced firing pin, new trigger, buffer and spring, but with steel golden tiger ammo (yes I know it's cheap surplus junk), I'd always get a misfire or two every ten rounds. Once I dropped this BCG in, I went 50 rounds without a single misfire. I was skeptical reading the description on the website, even says it may not solve light strikes on steel casings, but it seems to have done the trick for me.


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Great BCG! one question, does this work and feed ak magazines with a psa ks47 lower?