Faxon Firearms 20" Big Gunner .308 WIN Rifle-Length Salt Bath Nitride 4150 Series Barrel 1:10 Twist - 10A810R20NGQ
20-inch .308 Big Gunner barrel with rifle-length gas, 1:10 twist, and durable QPQ nitride finish
Only 6 left in stock
Faxon Firearms 20″ Big Gunner .308 WIN Rifle-Length Salt Bath Nitride 4150 Series Barrel 1:10 Twist
The Faxon Firearms 20″ Big Gunner .308 WIN Barrel is built to balance rigidity, weight, and heat management for large-frame AR platforms. Its Big Gunner profile uses a medium taper behind the gas block and a slimmer contour forward of the journal, helping reduce unnecessary weight while retaining the strength needed for competition, duty, and suppressed use.
Machined from 4150 steel and finished inside and out with Salt Bath Nitride, this barrel features button rifling, a 1:10 twist rate, rifle-length gas system, and an LR-308/DPMS-compatible extension. The .750″ gas block journal measures 1.9″ long for compatibility with common gas blocks and longer aftermarket systems.
Features
- 20″ .308 Winchester barrel
- Big Gunner profile balances weight and rigidity
- Medium taper behind the gas block
- Slimmer forward contour to reduce weight
- Rifle-length gas system
- 1:10 twist rate
- Button-rifled bore
- Salt Bath Nitride inside and outside
- .750″ gas block journal
- LR-308 / DPMS-compatible barrel extension
- Magnetic Particle Inspected
- 11-degree target crown
Specifications
- Manufacturer: Faxon Firearms
- MPN: 10A810R20NGQ
- Product Type: Rifle Barrel
- Platform: LR-308 / DPMS-Compatible Large-Frame AR
- Caliber: .308 Winchester
- Barrel Length: 20 in.
- Barrel Profile: Big Gunner
- Barrel Material: 4150 Steel
- Rifling: Button Rifled
- Twist Rate: 1:10
- Gas System Length: Rifle
- Gas Block Diameter: .750 in.
- Gas Block Journal Length: 1.9 in.
- Muzzle Thread: 5/8×24
- Inside Finish: Salt Bath Nitride
- Outside Finish: Salt Bath Nitride
- Barrel Extension: LR-308 / DPMS Compatible
- Crown: 11-Degree Target Crown
- Inspection: Magnetic Particle Inspected
- Weight: 2.24 lb
| Weight | 35.84 oz |
|---|---|
| Dimensions | 20 × 1.75 × 1.75 in |
| Finish | Nitride / Melonite |
| Barrel Profile | Big GUNNER |
| Cartridge Compatibility | 308 Win |
| Gas Block Journal | 0.75 |
| Barrel Length | 20 |
| Gas System Length | Rifle |
| Platform | AR-10 / LR-308 |
| Twist Rate | 1:10 |
| Muzzle Thread Pattern | 5/8×24 |
| MPN | 10A810R20NGQ |
| UPC | 816341023307 |
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.