FailZero EXO Coated .458 SOCOM Complete Bolt Carrier Group

Manufactured by Fail Zero
SKU: FZ-458-01-NH
MPN: FZ-458-01-NH
Manufactured by Fail Zero
3 Reviews

Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.



This Bolt Carrier Group is fully assembled and drop-in ready for most MIL-SPEC .458 SOCOM 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.

  • .458 SOCOM and .450 Bushmaster compatible
  • Magnetic particle inspected
  • Live fire tested
  • EXO Nickel Boron treated parts include:
  • Bolt, extractor, bolt carrier, cam pin, carrier key, and firing pin

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 Gauge.458 SOCOM
Carrier FinishNickel Boron
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedLive Fire Tested
Magnetic Particle InspectMagnetic Particle Inspected

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

3 reviews

  • 4 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Great customer service, poor quality item


I can't believe I'm saying something by FailZero is of poor quality, but alas it's true. The .458 is just now gaining truly widespread popularity, and technically it's still a wildcat cartridge, so I suppose a few growing pains are to be expected. However, this bolt simply does not work with standard .458 chambers. The Nickel-Boron coating, while an outstanding feature, adds just enough thickness to the outside of the bolt face to keep the chamber from closing on most ammunition, as well as factory go-gauges. The reason I gave the product 3 stars instead of 1 is simple: when I contacted FailZero about this problem, they did not hesitate to offer me a full refund, and they assured me that they would work to fix the problem in the future. In short, maybe this will be just as stellar as FailZero's other BCG's in the future, but for now definitely avoid it.

Fail Zero 458 socom love

by -

My Fail Zero BCG has been nothing short of outstanding! Even during setting the gas block. No crunched brass, headspace is perfect, not a hiccup out of it. The 458 runs like a Top even when I forgot to lube it. I will recommend this product to anyone!

Flawless functioning in 458 SOCOM

by -

I used the FZ bolt group in a recent 18" 458 SOCOM build. Fail Zero is typically my BCG of choice and this one hasn't disappointed. 100% flawless functioning and no case marks, scratches. In a World of variable quality 458S BCGs this is notable. I would buy this again in a heartbeat. (BTW, cleaning is easy. Wipe it off with a microfiber cloth)