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The 8.6 Blackout was designed from the ground up for short barrels and suppressors, and this 12" Big Gunner from Faxon is a great example of the platform done right. It sends a .338 projectile down a fast 1:3 twist bore, which spins the bullet hard enough to deliver real energy on target even when you're running heavy subsonic loads. If you've spent time behind a .300 Blackout, think of this as the bigger, meaner sibling that lives on the AR-10 side of the house.
The Big Gunner contour splits the difference between a government and pencil profile, giving you decent stiffness without turning your build into a boat anchor. At right around 2 pounds and 12 inches, it keeps the whole rifle short and quick to point, which is exactly what you want in a blind, a truck gun, or a suppressed setup where every inch counts. The pistol-length gas system is tuned for the short barrel, and the M18x1.5 muzzle threads with a tapered shoulder mean mounting a .338-rated can is straightforward. A thread protector and taper adapter come along for the ride.
Faxon machines these from 4150 CMV steel, a chrome-moly-vanadium alloy that handles heat and hard use well, then finishes it inside and out with salt bath nitride for corrosion resistance and easier cleanup. The bore is button rifled, and every barrel gets stress-relieved, air-gauge tested, magnetic particle inspected, and finished with an 11-degree target crown. It ships with a standard DPMS Gen 1 .308 extension, so it drops into common AR-10 pattern uppers.
This is a caliber that rewards short barrels, since the fast-burning powder gets full combustion before the bullet ever clears the muzzle. Pair it with a suppressor and heavy subsonic ammo and you get a deep, authoritative thump on steel with manageable recoil. It's equally at home on medium and large game hunts where a compact, quiet rig earns its keep. Just confirm your ammo matches the intended 8.6 BLK cartridge dimensions for reliable feeding.
Yes. It uses a standard DPMS Gen 1 .308 barrel extension, so it fits common AR-10/LR-308 pattern uppers. You'll want to verify your specific upper, gas block, and handguard clearances before building, since AR-10 parts vary between makers. Standard .308 or 6.5 Creedmoor magazines run 8.6 BLK with no loss of capacity.
The 1:3 twist spins the heavy .338 projectile extremely fast, which channels rotational energy into the target and helps stabilize heavy subsonic bullets. That aggressive spin is a big part of why the round hits hard even at lower velocities. It's one of the defining traits that separates 8.6 BLK from more conventional .338 cartridges.
It's arguably one of the best uses for this barrel. The 8.6 Blackout was engineered around short barrels and fast-burning powder that fully combusts before the bullet exits the muzzle, so you don't give up much running a 12" barrel. Pair it with a .338-rated suppressor and heavy subsonic ammo and you get a quiet, compact rig with serious thump on target.
Both subsonic and supersonic 8.6 Blackout loads are available, with subsonic heavy bullets being the go-to for suppressed work and hunting. Support is growing from makers like Gorilla Ammunition and Fort Scott Munitions. Make sure the ammo matches the intended 8.6 BLK cartridge dimensions so it feeds and functions reliably in your build.
| UPC | 816341026377 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 10A863P12NGQ |
| Barrel Length | 12" |
| Caliber/Gauge | 8.6 Blackout |
| Color | Black |
| Length | 12'' |
| Model | |
| Product Type | Barrel |
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