FAXON DUTY SERIES GUNNER PROFILE 20" RIFLE-LENGTH .308 WIN AR10 BARREL
Faxon
$259.00
(8 reviews)
Write a Review
Faxon
FAXON DUTY SERIES GUNNER PROFILE 20" RIFLE-LENGTH .308 WIN AR10 BARREL
Faxon Duty Series — 20" Big Gunner Profile .308 Win AR-10 Barrel
4150 CMV Steel • 1:10 Twist • Big Gunner Profile • Salt Bath Nitride • 5/8x24 Threads • Rifle-Length Gas
The Faxon Duty Series 20" Big Gunner .308 Win Barrel delivers long-range precision and duty-grade reliability on the AR-10 platform. Designed and manufactured 100% in-house in Cincinnati, Ohio, it refines our proven medium-taper concept with the Big Gunner contour for superior balance, heat control, and accuracy—especially as a suppressor host.
Machined from 4150 CMV steel and treated inside and out with Salt Bath Nitride (QPQ), each barrel is stress-relieved, button-rifled, air-gauge tested, MPI inspected, and finished with an 11° target crown. The rifle-length gas system provides a smooth recoil impulse for consistent shot-to-shot performance.
Built to fit LR-308 / DPMS-pattern receivers, this 20" barrel is ideal for precision duty builds, competition rifles, or any .308 carbine needing dependable reach and consistency.
Key Benefits
- Big Gunner Profile: Medium taper behind the gas block for rigidity; lighter forward section for balance and heat management.
- 4150 CMV Steel: Duty-grade strength and thermal stability for sustained fire.
- 1:10 Twist Rate: Stabilizes a broad range of .308 Winchester bullet weights.
- Salt Bath Nitride: Corrosion-resistant inside and out for long service life.
- Rifle-Length Gas System: Smooth cycling and reduced recoil impulse.
- 5/8x24 Threads: Standard interface for .30-cal suppressors and muzzle devices.
- DPMS-Compatible Extension: Fits LR-308 pattern receivers and components.
- Individually MPI & Headspaced: Precision-gauged with PTG tools for safety and consistency.
Specifications
Important Product Note
Faxon Duty Series barrels are engineered for rugged reliability and accuracy. Verify proper torque, headspace, and gas alignment when installing on DPMS Gen 1-pattern receivers. Faxon recommends professional installation. Improper installation or incompatible components may cause damage or void warranty.
Frequently Asked Questions
What is the Big Gunner profile?
A balanced medium-taper contour: rigidity behind the gas block with reduced forward weight for handling and heat control—excellent as a suppressor host.
Will this fit my AR-10 upper?
Yes. It is compatible with LR-308 / DPMS-pattern receivers and standard .308 BCGs and rifle-length gas components.
Is it suppressor-ready?
Yes. 5/8x24 muzzle threads support most .30-cal suppressors and devices rated for .308 Winchester.
Overview: 20" Duty Series Big Gunner .308 Win Barrel
The Faxon Duty Series 20" Big Gunner .308 Win Barrel provides maximum reach with rifle-length smoothness. Its 4150 CMV construction, full QPQ treatment, and 1:10 twist deliver durability, corrosion resistance, and consistent accuracy for precision, competition, or professional use. When the seconds count, count on the Gunner profile.
Every Faxon barrel is made in Cincinnati, Ohio, stress-relieved, MPI inspected, and individually headspaced with PTG gauges to ensure safe, repeatable performance.
- Barrel Material:
- 4150 CMV
- Barrel Type:
- Button Rifled
- Caliber:
- .308 WIN
- Barrel Length:
- 20"
- Barrel Twist:
- 1:10
- Barrel Profile:
- Big Gunner
- Barrel Gas System:
- Rifle
- Outside Finish:
- QPQ Nitride
- Muzzle Thread:
- 5/8x24
- Gas Block Diameter:
- .750"
- Gas Block Journal Length:
- 1.9"
- Barrel Extension:
- LR-308 (DPMS Compatible)
- Barrel Weight:
- 2.24 lbs
- Crown Type:
- Recessed 11-degree Target Crown
Reviews
-
Seems to work fine thus far.
Seems to work fine thus far. Shoots about 1 MOA with 168 gr. MATCH handloads.
-
Awesome as usual
Very accurate, perfect fit, and finish. About 200 rounds in, and it's a tack driver!
-
20” Big Gunner .308win
I haven’t installed it yet, but Faxon got it to me quickly. The finish is immaculate. I’ve purchased from Faxon before, and have been impressed by their quality. I can’t wait to try it out.
-
Balanced
This makes a great SPR/DMR barrel as it drops a significant amount of weight off the front of the gun to make it much more maneuverable. I was able to shoot a 1.125 inch group at 100 yards with the first 4 shots being well under an inch. I really think the barrel profile is the perfect balance between sturdy enough for a suppresor or moderately extended strings of fire but light enough to easily fire unsupported. Mine ejects at 2:00 to 3:00 with a 5.6 oz buffer; so, it's moderately overgassed. Otherwise, it's perfect.
-
good quality
fit is perfect, finish is flawless, shipping was great and quick. Will be purchasing from here again
-
308 barrel
Awesome barrel, fit perfectly and was packaged very well to protect it from shipping damages. Please get a chart for gas tube lengths needed per barrel so I can order the correct one the first time.
-
20” Big Gunner barrel AR 308
Great barrel for the price. Built as a hunting rifle and shoots <1 MOA with hand loads.
-
Good weight and finish
This is my first Faxon barrel and I'm definitely going to get more. The finish is excellent, the fit was amazing. Headspacing was spot-on. I was a bit confused by the two colored dots at the top of the extension, but not a huge deal. Gas block OD was *perfect*, as Ace Ventura would say, "Like a glove!" Crown was spiffy as hell and the weight overall is very good. Definitely worth it.