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This Faxon Duty Series Big Gunner barrel is one of those parts that gets a build right the first time. It runs a 20-inch length in .308 Winchester with a 1:10 twist, which stabilizes the wide range of common .308 loads you'll feed an AR-10, from lighter target rounds to heavier hunting bullets. The whole point of the Big Gunner contour is smart weight distribution: keep the mass behind the gas block where heat and rigidity count, then taper thinner out front to shed ounces and improve how the rifle carries and points.
The Big Gunner is the bigger sibling of Faxon's well-known 5.56 Gunner profile, blending the durability of a heavier taper near the chamber with the lighter feel of a pencil profile toward the muzzle. That means you get practical rigidity for repeat shots and heat management without hauling around a fence-post heavy barrel all day. The gas block journal is set at .750 inches for compatibility with most common gas blocks, and it's a full 1.9 inches long, which leaves room for longer blocks or aftermarket piston kits.
Duty Series barrels are machined from 4150 CMV steel with standard button rifling, then treated with salt bath nitride (QPQ) inside and out for corrosion resistance and a long service life. Every barrel is magnetic particle inspected and headspace checked, and Faxon backs it with their lifetime guarantee. The 11-degree target crown supports clean, consistent bullet exit for tighter groups.
It uses an LR-308 (DPMS-pattern) extension and a rifle-length gas system for that smooth, softer-shooting cycle longer .308 barrels are known for. The muzzle is threaded 5/8×24, the standard for .30-caliber muzzle devices and suppressors, so it works great as a suppressor host. As always, confirm your receiver set, bolt, and gas components line up before you start turning wrenches.
This barrel is set up with a rifle-length gas system, so you'll want a matching rifle-length gas tube. The gas block journal is .750 inches, which fits most common clamp-on and set-screw gas blocks. The 1.9-inch journal length also leaves room for longer blocks or aftermarket piston kits.
It uses an LR-308 (DPMS-pattern) barrel extension, which is the more common of the two AR-10 patterns. Always confirm your upper receiver, bolt, and gas components are DPMS-compatible before installing. If you're running an Armalite-pattern receiver, this won't be a drop-in fit.
Yes. The muzzle is threaded 5/8×24, which is the standard for .30-caliber muzzle devices and suppressors, and the thinner forward taper makes it a solid suppressor host. Just verify your can is rated for .308 and check alignment before firing.
The Big Gunner keeps mass behind the gas block for heat management and rigidity, then tapers thinner toward the muzzle to cut weight. That gives you a rifle that balances and points better than a full heavy barrel while still holding up to sustained fire. It's a great middle-ground for a do-it-all AR-10.
| UPC | 816341023307 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 10A810R20NGQ |
| Length | 20'' |
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