FailZero AR-15 BCG Nickel Boron No Hammer Black Bolt Carrier Group
FailZero
$150.69
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FailZero
FailZero AR-15 BCG Nickel Boron No Hammer Black Bolt Carrier Group
The FailZero AR-15 Nickel Boron BCG delivers mil-spec reliability with a cutting-edge EXO coating that sets it apart from standard phosphate or chrome-lined bolt carrier groups — engineered to run cleaner, longer, and harder in any AR-15 platform.
- Fully assembled and drop-in ready for mil-spec AR-15 upper receivers
- EXO Nickel Boron coating provides permanent dry lubricity without added oil
- Extreme wear resistance extends service life under high-round-count use
- Superior corrosion resistance protects against moisture, sweat, and field conditions
- Black finish on bolt offers easy visual contrast for inspection and maintenance
- Coated on all critical internal and external components for full-system protection
Who This Is For
This BCG is an ideal upgrade for AR-15 owners who demand a lower-maintenance, higher-durability solution — whether you're a competitive shooter running high round counts, a home-defense owner who wants reliability with minimal upkeep, or a builder looking for a quality drop-in BCG that outperforms standard mil-spec finishes right out of the box.
Specifications
| Brand | FailZero |
|---|---|
| Model | AR-15 BCG No Hammer — Black Bolt |
| Platform | AR-15 (Mil-Spec) |
| Caliber Compatibility | 5.56 NATO / .223 Rem / .300 BLK |
| Coating | EXO Nickel Boron (NiB) |
| Bolt Finish | Black |
| Carrier Finish | Nickel Boron |
| Bolt Material | Carpenter 158 Steel |
| Carrier Type | Full-Auto Profile |
| Assembly | Fully Assembled (No Hammer) |
| Gas System | Direct Impingement |
| Country of Origin | USA |
Frequently Asked Questions
What does "No Hammer" mean, and do I need to purchase one separately?
The "No Hammer" designation means this BCG ships without a hammer included. This is common when builders already have a complete lower parts kit or trigger group installed. You will need a compatible mil-spec hammer to complete your build — most standard AR-15 hammer and trigger group kits are fully compatible with this BCG.
Does the EXO Nickel Boron coating require lubrication during use?
One of the standout benefits of FailZero's EXO Nickel Boron coating is its permanent dry lubricity, meaning the BCG can function reliably with little to no added lubrication. While a light application of oil is never harmful, many users run this BCG dry or nearly dry — making it especially well-suited for dusty, sandy, or cold-weather environments where oil can attract fouling or thicken.
Is this BCG compatible with both 5.56 NATO and .300 Blackout uppers?
Yes. This mil-spec AR-15 BCG is compatible with standard 5.56 NATO, .223 Remington, and .300 Blackout upper receivers, as all three calibers use the same bolt face and carrier dimensions. Simply pair it with the appropriate barrel, gas system, and magazine for your chosen caliber and you're ready to go.
