FailZero EXO Nickel Boron M16 / M4 5.56 Bolt Carrier Group
In stock
0.00128 
0.05431 
139.99000 
1.41461 
139.99700 
0.31560 
FailZero EXO Nickel Boron M16 / M4 5.56 Bolt Carrier Group
The First in Nickel Boron Coated BCGs
The FailZero EXO Nickel Boron M16 / M4 5.56 Bolt Carrier Group is a premier upgrade for AR-15 rifles chambered in 5.56 NATO or .223 Remington. Designed to exceed mil-spec standards, this complete bolt carrier group is fully assembled and ready to drop into most AR-15, M4, or M16 upper receivers. Built with precision and reliability in mind, this BCG is ideal for shooters who demand high performance, low maintenance, and battle-proven durability.
At the core of the FailZero BCG is an 8620 steel carrier and a Carpenter 158 steel bolt, both of which are Magnetic Particle Inspected (MPI), High Pressure Tested (HPT), and shot-peened for superior structural integrity. These materials are trusted across military and law enforcement platforms for their proven strength under stress.
What truly sets this bolt carrier group apart is FailZero’s patented EXO Nickel Boron (NiB) coating, which is applied to all critical components. This advanced finish provides permanent dry lubricity, significantly reducing friction and wear. It also offers enhanced corrosion resistance and allows for easier cleaning and maintenance even under extended firing schedules. The EXO NiB coating will not chip, flake, or wear off under extreme heat and high-volume shooting.
This BCG is laser-etched with the FailZero logo and proudly made 100% in North Carolina, USA. Whether you’re upgrading an existing rifle or assembling a new build, the FailZero EXO M16/M4 5.56 BCG delivers reliability and performance trusted by competitive shooters, hunters, and tactical professionals alike.
Nickel Boron Treated Parts Include:
- Bolt & Extractor (5.56/.223 compatible)
- Bolt Carrier (8620 Steel)
- Extractor
- Cam Pin
- Carrier Key (properly staked)
- Firing Pin
Specifications:
- Caliber Compatibility: 5.56 NATO / .223 Remington
- Platform: AR-15, M16, M4 (mil-spec upper receivers)
- Construction: 8620 Steel Carrier, Carpenter 158 Steel Bolt
- Finish: EXO Nickel Boron Coating on All Key Components
- Made in the USA (North Carolina)
If you’re looking to enhance your rifle with a bolt carrier group that runs smoother, cleans easier, and lasts longer, the FailZero EXO Nickel Boron M16 / M4 5.56 Bolt Carrier Group is the perfect choice.
Product Information
| Manufacturer | FailZero |
|---|---|
| Platform | AR15 |
| Caliber | 223 Rem, 300 Blackout, 350 Legend, 5.56 NATO |
| Carrier Material | 8620 Steel |
| Bolt Material | C158 Steel |
| Finish | Nickel Boron |
| Color | Silver |
| Compatibility | Standard AR15 components |
| Features | MPI Inspected, Shot Peened, FA Serrations |
| Made in USA | Yes |
| Weight | 11.52oz |
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