FAXON DUTY SERIES PENCIL PROFILE 18" RIFLE-LENGTH .308 WIN AR10 BARREL
Faxon
$269.00
(2 reviews)
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Faxon
FAXON DUTY SERIES PENCIL PROFILE 18" RIFLE-LENGTH .308 WIN AR10 BARREL
Faxon Duty Series — 18" Pencil Profile .308 Win AR-10 Barrel
4150 CMV Steel • 1:10 Twist • Pencil Profile • Salt Bath Nitride • 5/8x24 Threads • Rifle-Length Gas
The Faxon Duty Series 18" Pencil Profile .308 Win Barrel represents the ultimate balance between light weight and precision. Designed and manufactured 100% in-house at Faxon Firearms in Cincinnati, Ohio, this barrel brings Faxon’s acclaimed Pencil profile to the AR-10 platform, offering fast handling and exceptional accuracy for long-range and field applications.
Machined from 4150 CMV steel, each barrel is stress-relieved, air-gauge tested, magnetic particle inspected, and treated inside and out with a Salt Bath Nitride (QPQ) finish for maximum corrosion resistance and longevity. The precisely engineered taper of the Pencil profile removes every ounce of unnecessary weight while preserving harmonic stability for consistent accuracy.
Built for LR-308 / DPMS-pattern receivers, this 18” rifle-length gas barrel offers the smoothest recoil impulse and optimized balance for lightweight .308 AR builds without sacrificing performance.
Key Benefits
- Pencil Profile: Faxon’s lightest .308 barrel — perfectly tapered for weight reduction and accuracy retention.
- 4150 CMV Steel: Duty-grade Mil-Spec steel for strength and heat resistance under sustained use.
- 1:10 Twist Rate: Ideal for stabilizing a wide range of .308 Winchester bullet weights.
- Salt Bath Nitride Finish: Corrosion- and wear-resistant for long-term durability.
- Rifle-Length Gas System: Provides soft recoil and consistent cycling in 18" AR-10 builds.
- 5/8x24 Muzzle Threads: Compatible with most .30-cal muzzle devices and suppressors.
- DPMS-Compatible Extension: Designed for LR-308 pattern receivers.
- Individually MPI & Headspaced: Ensures safe, consistent, and accurate performance shot after shot.
Specifications
Important Product Note
Faxon’s Pencil profile barrels are designed for shooters who demand the lightest possible configuration without sacrificing accuracy. Proper torque and alignment are essential to avoid stress on the tapered profile during installation. Faxon recommends professional installation and confirmation of headspace on DPMS Gen 1-pattern receivers. Improper installation or use of incompatible parts may result in damage or void warranty.
Frequently Asked Questions
Why choose a Pencil profile barrel?
The Pencil profile provides unmatched weight savings, improved maneuverability, and fast handling — all while retaining impressive accuracy and barrel life.
Is this barrel compatible with AR-10 uppers?
Yes. It’s designed for LR-308 / DPMS-pattern uppers with standard .308 Win bolts and rifle-length gas systems.
Can I use a suppressor with this barrel?
Yes. The 5/8x24 threads are standard for .30-cal suppressors and muzzle devices. Verify suppressor caliber compatibility before installation.
Overview: 18" Duty Series Pencil Profile .308 Win Barrel
The Faxon Duty Series 18" Pencil Profile .308 Win Barrel delivers unmatched lightness and precision for rifle-length AR-10 builds. Constructed from 4150 CMV steel with a full salt bath nitride treatment, this barrel provides excellent corrosion resistance, thermal stability, and smooth cycling. Ideal for lightweight precision rifles or hunting platforms where balance and speed matter most.
All Faxon barrels are proudly made in Cincinnati, Ohio, and undergo magnetic particle inspection, stress-relieving, and headspace verification to ensure the highest quality and performance standards in the industry.
- Barrel Material:
- 4150 CMV
- Barrel Type:
- Button Rifled
- Caliber:
- .308 WIN
- Barrel Length:
- 18"
- Barrel Twist:
- 1:10
- Barrel Profile:
- Pencil
- Barrel Gas System:
- Rifle
- Outside Finish:
- QPQ Nitride
- Muzzle Thread:
- 5/8x24
- Gas Block Diameter:
- .750"
- Gas Block Journal Length:
- 1.1"
- Barrel Extension:
- LR-308 (DPMS Compatible)
- Barrel Weight:
- 1.97 lbs
- Crown Type:
- Recessed 11-degree Target Crown
Reviews
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Barrel Gas Port Location
The barrel appears to be made well. I scoped the inside to see the internal condition. The only issue I found was the gas port hole was cut in the middle of a land. I wonder if this will cause issues with accuracy as the gas hole can cause the spin to momentarily disrupt.
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FAXON 18" Pencil, .308 WIN, Rifle-Length, 4150, Nitride
Absolutely a beautiful barrel. I installed it in an Aero Precion enhanced upper and it resulted in a lightweight upper that balances perfectly. I haven't had a chance to shoot it yet but if it is as accurate as the pencil barrel I installed on my AR-15, it will be a tack driver.