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Building or refreshing a .308 AR? This 18-inch Diamondback barrel hits the sweet spot for a full-size semi-auto .308 rig. The 18-inch length keeps your velocity up without turning the rifle into a boat anchor, and the rifle-length gas system does exactly what a longer gas system should on a .308: it spreads the pressure curve out so the action cycles smoother, the recoil impulse feels softer, and your brass comes out in better shape for reloaders.
The barrel is cut from 4150 chrome moly vanadium steel, then finished in black nitride inside and out. That nitride treatment is more than a looks thing. It hardens the surface, fights corrosion, and makes cleanup a breeze after a long range day or a wet hunt. Inside you get 5R button rifling with a 1:10 twist, which is the go-to rate for stabilizing the heavier .308 loads most folks are running, from 168 and 175-grain match bullets down to standard 147 and 150-grain fodder. It also wears M4 feed ramps and a medium contour, so you get a good balance between heat tolerance during strings of fire and a weight that still handles well offhand.
The muzzle comes threaded 5/8×24, the standard pitch for .308-caliber muzzle brakes, flash hiders, and suppressor mounts, so whatever device you already have will thread right on. This is a DPMS-pattern barrel, which covers the vast majority of AR-10 style uppers on the market. Before ordering, confirm your upper and bolt are DPMS/LR-308 pattern rather than an Armalite AR-10 or a proprietary GEN2 setup, since those use different barrel extensions.
This is a bare barrel, so you'll supply your own gas block, gas tube, barrel nut, and handguard to finish the build. For anyone assembling a shooter-grade .308 upper without paying custom-barrel money, it's a straightforward, dependable piece to build around.
This barrel uses a DPMS-pattern (LR-308) barrel extension, which fits the majority of .308 AR-10 style uppers on the market. It will not fit Armalite AR-10 or proprietary GEN2 uppers, which use different extensions. Confirm your upper and bolt are DPMS/LR-308 pattern before ordering.
No, this is a bare barrel only. You'll need to add your own low-profile gas block, a rifle-length gas tube, a barrel nut, and a handguard to complete the upper. That's normal for a component barrel and lets you set the build up exactly how you want.
It's a 1:10 twist, which is the standard rate for .308 Winchester AR builds. That handles the popular heavier match loads in the 168 to 175-grain range as well as common 147 to 150-grain ammunition with good stability.
On an 18-inch .308, the rifle-length gas system pulls gas further down the barrel at a lower pressure, which smooths out the cycling and softens felt recoil. It's also easier on your brass, so reloaders tend to prefer it. It's a well-matched setup for this barrel length.
| UPC | 815875019114 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | DB308R18M50B10-R |
| Length | 18" |
| Model |
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