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The Faxon Gunner is one of those barrels that makes a short AR-15 build feel right the moment you shoulder it. This 10.5-inch .300 Blackout version runs Faxon's Gunner contour, which takes the beefier Government profile behind the gas block and blends it into a slimmer Pencil profile out front. The result is a barrel that keeps weight back toward your body where it helps balance and heat resistance, while trimming the ounces up front that make a rifle feel muzzle-heavy. On a pistol or SBR build, that difference shows up fast during transitions and long range days.
Under the finish, this is a serious piece of steel. It's button rifled from 4150 CMV (chrome-moly-vanadium) mil-spec steel with a 1:8 twist, then treated with salt bath nitride inside and out for corrosion resistance and an easy-cleaning bore. The 1:8 twist is the sweet spot for .300 Blackout, stabilizing everything from light supersonic rounds to the heavy subsonic loads a lot of folks run suppressed. Every barrel is stress relieved, air-gauge tested, magnetic particle inspected, and headspace checked before it leaves Faxon's Cincinnati facility.
The pistol-length gas system is a smart match for a 10.5-inch .300 Blackout, giving reliable cycling across a wide range of ammo whether you're running a can or shooting bare muzzle. You get a .750-inch gas block journal, an M4 barrel extension for a solid receiver lockup, 5/8×24 muzzle threads that play nice with standard .30-caliber muzzle devices and suppressor adapters, and an 11-degree target crown to keep your groups tight. The gas port is drilled after the extension is installed, so alignment stays true. If you're piecing together a lightweight truck gun, a suppressed home-defense setup, or a do-it-all compact carbine, this barrel gives you a dependable, accuracy-minded foundation to build on. Backed by Faxon's lifetime guarantee.
This barrel has a 1:8 twist, which is the go-to rate for .300 Blackout. It stabilizes a wide range of projectile weights, from lighter supersonic rounds to the heavy subsonic loads that suppressed shooters tend to prefer. That makes it a solid all-around choice if you plan to run a mix of ammo.
Yes, the pistol-length gas is a natural match for a short .300 Blackout and works well both suppressed and unsuppressed. The 5/8×24 muzzle threads accept standard .30-caliber suppressor adapters and muzzle devices. If you plan to swap between subsonic and supersonic loads a lot, an adjustable gas block can help fine-tune the recoil impulse.
No, this listing is the bare barrel only, so you'll need to supply your own .750-inch gas block and pistol-length gas tube. The gas port is already drilled and aligned at the factory. Faxon also offers a separate version of this barrel that ships with a pre-pinned gas block if you'd rather skip that step.
It uses a standard M4 barrel extension, so it drops into any mil-spec AR-15 upper receiver. Each barrel is headspace checked at the factory for a reliable lockup. You'll still want the usual barrel nut, gas system, and handguard to complete the build.
| UPC | 816341023215 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 15A38P10NGQ |
| Barrel Length | 10.5'' |
| Caliber/Gauge | .300 AAC Blackout |
| Color | Black |
| Length | 10.5'' |
| Model | |
| Product Type | Barrel |
| Sights | No |
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