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If you're after the most compact 5.56 build possible, this is where it starts. The Diamondback DB barrel measures 5.5 inches and runs a pistol-length gas system, which is exactly what you want when the barrel gets this short. The shorter gas system pulls high-pressure gas close to the chamber, and that's what gives a stubby barrel like this enough push to cycle reliably. It's made for dedicated close-quarters pistol and PDW-style projects where overall length matters more than reaching out to distance.
The barrel is machined from 4150 chrome moly vanadium steel in a heavy profile. That extra meat up front does a couple of good things: it adds rigidity for more consistent shot-to-shot accuracy and it soaks up heat better during faster strings of fire. It's button rifled with a 1:8 twist, which is the do-it-all twist rate for 5.56 and .223, stabilizing everything from lighter varmint loads up through heavier 70-plus grain match and defensive bullets. The muzzle comes threaded 1/2×28, so your favorite flash hider, comp, or muzzle brake bolts right on, and the M4 feed ramps are cut in to keep feeding smooth.
The black nitride finish isn't just for looks. Nitride is a surface treatment that hardens the steel and adds real corrosion resistance inside and out, which matters a lot on a barrel that's going to run hot and dirty with a pistol-length gas system. It also cleans up easy, which you'll appreciate since shorter gas systems tend to throw more fouling.
These are the same quality barrels Diamondback uses on their own factory builds, so you're getting OEM-grade parts at a builder-friendly value. It's a great fit for the home gunsmith finishing an upper or the tinkerer who likes building from the ground up. Worth noting: just the bare barrel is included here, so you'll still need your gas block, gas tube, handguard, and the rest of your upper parts to complete the build.
It's paired with a pistol-length gas system for exactly that reason. The short gas system taps high-pressure gas close to the chamber, which gives a stubby barrel enough energy to run the action. Like any very short 5.56 build, it'll be happiest with quality, full-power ammo, and a properly tuned buffer setup helps too.
It's a 1:8 twist, which is the most versatile option for 5.56 and .223. That twist stabilizes a wide range of bullet weights, from lighter 55-grain loads all the way up through heavier 70-plus grain match and defensive rounds. For an all-around barrel, 1:8 is the safe bet.
Yes. A barrel chambered in 5.56 NATO safely handles both 5.56 and .223 Remington, since the 5.56 chamber is cut with a little more room. That said, out of a barrel this short you may see some velocity and accuracy differences depending on the load, so it's worth testing a few to find what your barrel likes.
No, this is the bare barrel only. You'll need to supply your own pistol-length gas tube, gas block, handguard, muzzle device, and the rest of your upper parts to finish the build. Make sure any gas block and rail you choose are sized to clear a barrel this short.
It's built for the most compact, maneuverable 5.56 platform you can put together, think dedicated close-quarters and PDW-style builds where short overall length is the priority. You're trading long-range velocity for a tiny, handy package. If you want more reach and easier cycling, a longer barrel in the 10.5 to 11.5 inch range is more forgiving.
| UPC | 815875019152 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | DB556P5.5H50B8-R |
| Length | 5.50" |
| Model |
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