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The Faxon Duty Series Big Gunner is an 18-inch .308 Winchester barrel cut for LR-308 / DPMS-pattern AR-10 builds, and it hits that sweet spot between reach and manageable weight. The Big Gunner contour is the big brother to Faxon's popular 5.56 Gunner profile, using a medium taper behind the gas block for rigidity and then thinning out toward the muzzle to shed forward weight. The result is a barrel that stays steady under sustained fire but doesn't feel like you're swinging a fence post around.
The rifle-length gas system is the standout here. On an 18-inch barrel it stretches the dwell time out, which softens the recoil impulse and gives you a smoother, more controllable cycle. That longer gas system also opens up plenty of tuning room if you're running an adjustable gas block or adding a can. Speaking of cans, the trimmer forward taper makes this a genuinely good suppressor host without turning your rifle into a boat anchor.
Faxon machines these from 4150 CMV steel, fully stress-relieved, then treats them inside and out with salt bath nitride (QPQ) for corrosion and wear resistance that holds up to real use. It's button rifled with a 1:10 twist, which stabilizes a wide spread of .308 bullet weights, so you're not locked into one load. The muzzle wears 5/8×24 threads for standard .30-cal muzzle devices and suppressors, capped with an 11-degree target crown for clean, repeatable bullet exit.
The .750-inch gas block journal fits most common blocks, and the 1.9-inch journal length leaves room for longer blocks or aftermarket piston setups. The LR-308 (DPMS-compatible) extension drops into DPMS-pattern uppers, and every barrel is magnetic particle inspected and headspaced before it leaves the shop in Cincinnati. Whether you're building a general-purpose blaster, a precision rig, or a duty gun, this one covers a lot of ground.
This barrel uses an LR-308 (DPMS-compatible) extension, so it fits DPMS-pattern AR-10 uppers along with standard .308 bolt carrier groups and rifle-length gas components. As with any AR-10 build, it's worth verifying headspace, gas alignment, and torque during installation since the .308 AR world has some part variation. If you're not comfortable doing that yourself, a gunsmith can get it dialed in quickly.
The gas block journal measures .750 inches in diameter, which matches most common .750 gas blocks on the market. The journal is 1.9 inches long, so you've also got room for longer blocks or aftermarket piston kits. It runs a rifle-length gas system, so pair it with rifle-length gas tube and handguard.
Yes. The muzzle is threaded 5/8×24, which is the standard interface for most .30-caliber suppressors and muzzle devices. The trimmer forward taper of the Big Gunner profile was designed with suppressor-host use in mind, so it's a natural fit for a quieter setup. Just confirm your can or mount is rated for .308 and check bore alignment.
The 1:10 twist rate stabilizes a broad range of .308 Winchester loads, which makes this barrel versatile whether you're shooting lighter hunting bullets or heavier match projectiles. It's a solid all-around choice if you like to swap between different ammo. For the heaviest specialty match bullets, some folks prefer faster twists, but 1:10 covers the vast majority of common .308 loadings.
| UPC | 816341023284 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 10A810R18NGQ |
| Barrel Length | 18" |
| Caliber/Gauge | .308 / 7.62 NATO |
| Color | Black |
| Length | 18" |
| Model | |
| Product Type | Barrel |
| Sights | No |
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