Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group - Nickel Boron - D257
Nickel boron BCG for smoother cycling, easier cleaning, and lasting AR reliability
In stock
Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group – Nickel Boron
The Dirty Bird Industries Nickel Boron Bolt Carrier Group is built for shooters who want smoother operation, easier maintenance, and dependable performance from their AR-15. Its nickel boron coating reduces friction, helps resist carbon buildup, and improves cleanup after hard use. Built to Mil-Spec dimensions with quality materials throughout, it is a strong upgrade for .223, 5.56 NATO, and .300 Blackout rifle builds.
Features
- Compatible with 5.56 NATO, .223 Remington, and .300 Blackout
- Nickel boron coating on the bolt, carrier, and gas key
- Reduced friction for smoother cycling
- Helps prevent carbon buildup for easier cleaning
- Forward assist serrations
- Shrouded firing pin
- Forged Mil-Spec gas key with Grade 8 hardware and proper staking
- Made in the USA
- Backed by the Dirty Bird Industries Lifetime Warranty
Specifications
- Platform Compatibility: AR-15
- Caliber Compatibility: 5.56 NATO / .223 Remington / .300 Blackout
- Carrier Material: 8620 tool steel
- Bolt Material: 9310 carpenter steel
- Finish: Nickel boron
- Gas Key: Forged Mil-Spec, properly staked
- Hardware: Grade 8
- Inspection: Magnetic particle inspected
- Bolt Treatment: Shot peened
- Extractor: Tool steel
- Extractor Spring Setup: Mil-Spec spring, black insert, Viton O-ring
- Weight: 11.52 oz
| Weight | 11.84 oz |
|---|---|
| Dimensions | 10.9 × 3.7 × 1.6 in |
| Bolt Material | 9310 Steel |
| Finish | Nickel Boron |
| Cartridge Compatibility | .223/5.56 NATO/.300 BLK |
| Carrier Profile | M16 |
| Magnetic Particle Inspected | Magnetic Partical Inspected |
| Platform | AR-15 |
| Bolt Finish | Nickel Boron |
| MPN | D257 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
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