FailZero M16 / AR-15 EXO Coated Bolt Carrier Group

Manufactured by Fail Zero
SKU: 009-FZM16-4-01-NH
MPN: 009-FZM164-01-NH
Manufactured by Fail Zero
157 Reviews
Add to cart for sale price $138.59 $169.99

In Stock

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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. The M16 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: BCG may ship with either a dark FailZero logo or a subdued lasered FailZero logo.

  • M16 cut carrier
  • Magnetic particle inspected
  • Live fire tested
EXO Nickel Boron treated parts include:
  • Bolt, extractor, bolt carrier, cam pin, carrier key, and firing pin
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Bolt FinishNickel Boron
Bolt MaterialCarpenter 158 Steel
BrandFail Zero
Caliber Gauge5.56 NATO
Carrier FinishNickel Boron
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedLive Fire Tested
Magnetic Particle InspectMagnetic Particle Inspected
Weight11.4 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

2 Shots


2 rounds it jammed in chamber had to beat it out.. tried a old ar15 bcg work fine

Failed one 2 many


3rd, 12th, 121st, 122nd, & 123rd round resulted in FTE using a brand new FZ EXO nickel boron coated BCG placed in a SPIKES Lower Receiver containing a BRO DIT.AE 55gr 223 REM used in a Magpul Gen2 magazine.FZ failed one 2 many.Eventually used a PSA bcg to enjoy the rest of day.

Great Product and Service


Another great product from PA at a great price, As always, the shipping crew comes through on their end and my products were at my doorstep in 2 days. On another note, Nick and his crew over at customer took care of me, as well.

Fail zero EXO(Nickel Boron coated ) M16 bolt Carri


As always, good deal's good service and, top of the line products.

Nice BCG


Built well, and functioned perfectly dropped in for 200 rounds so far. Expected the coating to be a bit slicker to the touch, and to completely wipe clean. It doesn't though, and you still need to do a tiny bit of scraping on the back of the bolt. Everything else wiped right off. If your looking for a bcg this is a good buy. If you already have a functioning bcg, I would only buy it if I had spare cash I was looking to spend.



Can't say a whole lot just built the gun. Seems to be a very well built bolt assembly. Even the gun shop that looked at it said it was a quality piece.

FailZero EXO (Nickel Boron Coated) M16 M4 Bolt Car


Excellent BCG, very smooth and matches up perfect with my Ballistic Advantage 18" barrel. Best price I have seen! Shipping was typical "Fast PA!"

FailZero Nickel Boron Bolt M16


Excellent bolt. No cycling issues at all wipes clean inside and out. Great Product And Great Service as always from Primary Arms. Thanks Again,Primary Arms

EXCELLENT! FailZero EXO (Nickel Boron Coated)


Excellent product and great quality. I tested as soon as i received it, runs flawlessly. It looks to be lubed all the time without adding lube :)

Easy clean and smooth as silk


Excellent product, Fall Zero and WMD both are GTG. Can't beat the price on this.