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The .338 ARC is Hornady's big-bore answer to the subsonic AR-15 question, and Faxon's Match Series Gunner barrel is built to get the most out of it in a compact package. At 11.5 inches with a 1:5 twist, this one is aimed squarely at SBR builds and AR pistols where you want serious downrange thump without dragging around an AR-10. The .338 ARC runs off a 6.5 Grendel bolt face and standard-style AR-15 mags, so a lot of folks can move into it without reinventing their whole setup.
The Gunner contour is Faxon's hybrid between a Government profile and a lightweight Pencil, so you get rigidity where the barrel needs it near the chamber and shed weight out front. That translates to a rifle that points fast and stays balanced, which matters a lot on a short, punchy build like this. The barrel tips the scale right around 1.08 lbs, making it easy to keep the whole gun nimble.
Everything happens in-house at Faxon's shop in Cincinnati, Ohio. The barrel is machined from 416R stainless, 5R button rifled, then stress relieved, air-gauge tested for bore consistency, and 100% magnetic particle inspected. The finish is a Salt Bath Nitride (QPQ) treatment that fights corrosion and wear inside and out, and the muzzle wears a recessed 11-degree target crown for clean, consistent bullet exit.
The pistol-length gas system is tuned for reliable cycling in short barrels, and the 5/8×24 muzzle threads open the door to common .30 and .338 caliber muzzle devices and rated suppressors. Since .338 ARC was engineered around quiet, heavy subsonic loads, this barrel is a natural fit for a suppressed hunting or range rig. Faxon recommends running Duramag .400 Legend magazines and pairing it with their .338 ARC optimized upper for the smoothest feeding out of the box.
This 11.5" barrel is right at home in AR-15 pistol and SBR builds where compact handling matters. The .338 ARC was designed around big-bore subsonic performance in a short package, so it's a strong pick for a suppressed hunting or range rig. You get .338-class terminal energy without moving up to an AR-10.
The fast 1:5 twist is there to stabilize the heavy subsonic projectiles the .338 ARC leans on, like the 307-grain loads, especially out of a short barrel. Faster twist helps keep those long, heavy bullets spinning true when velocity is low. It's a deliberate choice for getting reliable accuracy from a compact configuration.
Yes, the .338 ARC runs on the AR-15 platform and uses a 6.5 Grendel bolt face, so your standard lower carries right over. Faxon recommends Duramag .400 Legend magazines for the best feeding, and pairing the barrel with their .338 ARC optimized upper cuts down on fitment work. Some builds may need minor tuning to dial in feeding, so it's worth checking function with your chosen ammo.
The 5/8×24 muzzle threads accept common .30 and .338 caliber muzzle devices and rated suppressors. Since .338 ARC was built with quiet, heavy subsonic loads in mind, this barrel pairs naturally with a can for suppressed shooting. Always confirm your suppressor is rated for the caliber before mounting it.
| UPC | 816341029064 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 15B338A5P115NGQ-5R-NP3 |
| Barrel Length | 11.5" |
| Caliber/Gauge | .338 ARC |
| Color | Black |
| Length | 13.6000 |
| Model | |
| Product Type | Barrel |
| Sights | No |
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