FailZero EXO Nickel Boron AR-15 Bolt Assembly 5.56 NATO / .223 Mil-Spec Carriers EXO-BOLTASSEMBLY01
by Failzero
User Ratings
No ratings yet
Be the first to review this product
FailZero EXO Nickel Boron AR-15 Bolt Assembly description: The FailZero EXO Bolt Assembly is a fully assembled bolt built for 5.56/.223 AR-pattern rifles and designed to work with most mil-spec AR-15, M16, and M4 bolt carrier groups. Finished with FailZero EXO Nickel Boron (NiB), this bolt assembly delivers permanent dry lubricity to reduce friction, helping improve cycling performance while making cleanup faster and easier. The NiB treatment also adds enhanced wear and corrosion resistance for long-lasting reliability.
Product Highlights:
- EXO Nickel Boron (NiB) coating for permanent dry lubricity and reduced friction
- Compatible with most mil-spec AR-15, M16, and M4 carriers
- 5.56/.223 bolt assembly supplied fully assembled for straightforward replacement
- Enhanced wear resistance for extended service life under hard use
- Corrosion-resistant finish supports easier maintenance and cleaning
Specs: Brand: FailZero Product Type: Bolt Assembly Caliber Compatibility: 5.56 NATO / .223 Remington Carrier Compatibility: Most mil-spec AR-15, M16, and M4 carriers Finish/Coating: EXO Nickel Boron (NiB) UPC: 881314861873 Manufacturer Part Number: EXO-BOLTASSEMBLY01
Specifications
- Manufacturer:
- Failzero
- Category:
- bolt-carrier-group
- Caliber:
- 5.56x45mm NATO
- Platforms:
- AR-15
- UPC:
- 8228852924538
- MPN:
- EXO-BOLTASSEMBLY01
- Required Component:
- Yes
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$95.99
Lowest
$81.18
Highest
$98.95
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertWhat's Included in this Bundle
Similar Products

Bravo Company Bolt Carrier Group, Black
Bravo Company Manufacturing (BCM)
$238.99

Toolcraft Logo'd Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt
Toolcraft
$119.99
Microbest PSA Custom Fathers of Freedom 5.56 NATO Full Auto Profile Phosphate Bolt Carrier
Microbest
$134.95

Aero Precision M16 / AR-15 Bolt Carrier Group - Parkerized - No Logo
Aero Precision
$126.84

M16 5.56 Bolt Carrier Group
Colt
$196.12

Toolcraft Non-Logoed Premium 5.56 Nickel Boron BCG with Carpenter 158 Bolt
Toolcraft
$109.99

Faxon Firearms Bolt Carrier Group, Black - Precision Bolt Carrier Group for Superior Performance
Faxon Firearms
$155.99

Bravo Company Bolt Carrier Group, Flat Dark Earth
Bravo Company Manufacturing (BCM)
$222.99
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
.308 Win vs. 6.5 Creedmoor for AR-10 Builds
A technical comparison of .308 Winchester and 6.5 Creedmoor for AR-10 platform builds — covering ballistics, recoil, parts availability, and which cartridge fits which use case.
5 min read
Guide
AR-10 Receiver Patterns: DPMS vs. Armalite Compatibility
The AR-10 has two incompatible receiver patterns — DPMS and Armalite — that look similar but do not share parts. This guide explains the differences and how to buy correctly.
6 min read
Guide
The AR-10 Platform: What It Is and How It Differs from the AR-15
A practical overview of the AR-10 — its origins, how it differs from the AR-15, available calibers, and when it makes more sense than a standard AR-15 build.
6 min read