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The .300 Blackout cartridge was designed from the ground up to run in short barrels, and that is exactly why the Diamondback DB-15 in this configuration makes so much sense. The 10 inch heavy profile barrel is machined from 4140 chrome-moly vanadium steel with a black nitride treatment for corrosion resistance and long service life, and the 1:8 right-hand twist stabilizes everything from light supersonic loads to heavy 220 grain subsonics. The muzzle wears an A2 flash hider on standard 5/8×24 threads, so swapping to a different muzzle device or adding a suppressor is a quick job. If quiet shooting is on your list, this is one of the better starting points you will find in a factory AR pistol.
Diamondback builds the DB-15 on forged 7075-T6 aluminum upper and lower receivers, the same material spec you would expect from guns costing quite a bit more. The pistol-length direct impingement gas system is matched to the short barrel for reliable cycling, and the bolt carrier is a shot-peened, magnetic particle inspected Mil-Spec 8620 unit. The OD Green Cerakote finish over the receivers and handguard gives it a clean, purposeful look that stands out from the sea of plain black ARs on the rack.
A 9 inch M-LOK handguard leaves plenty of real estate for lights, hand stops, and sling mounts, while the full-length top rail is ready for whatever optic you prefer. It ships without sights, so plan on adding a red dot or a set of backup irons. The SB Tactical SBA3 brace is adjustable through five positions and the Magpul MOE grip fills the hand nicely. At 26 inches overall, this thing handles tight spaces the way a full-size carbine simply cannot, which makes it a natural fit for home defense, truck duty, or just a fun day burning through PMAGs. Speaking of which, Diamondback includes a 30-round Magpul Gen M3 PMAG, so you are ready to load up and go from day one.
Yes, the 10 inch barrel comes threaded 5/8×24, which is the standard thread pitch for .30 caliber muzzle devices and suppressors. Just remove the included A2 flash hider and mount your can or a suppressor-compatible muzzle device. The 1:8 twist handles heavy subsonic loads well, making this a solid host for quiet shooting.
No, it ships without sights, which is pretty common for AR pistols in this class. The flattop upper and full-length rail give you a clean slate for a red dot, low-power variable optic, or flip-up iron sights. Most folks running a 10 inch .300 Blackout go with a red dot for fast target acquisition up close.
The pistol-length gas system is tuned for the short barrel and runs supersonic loads reliably right out of the box. Subsonic ammunition generally cycles best when shooting suppressed, since the added back pressure helps the action run. That is typical behavior for any .300 Blackout gun, not something unique to this one.
It uses standard AR-15 pattern magazines and includes one 30-round Magpul Gen M3 PMAG from the factory. While .300 Blackout feeds from regular 5.56 mags, many people prefer dedicated .300 Blackout marked PMAGs for reliable feeding with heavy subsonic bullets and to keep calibers clearly separated. Either way, mags are cheap and everywhere.
| UPC | 810035754416 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | DB1916B101 |
| Action | |
| ATF Type | Pistol |
| Barrel Length | 10" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Length | 26 |
| Magazine Included | 1 x 30-Round |
| Model | |
| Number of Magazines | 1 30rd. PMAG |
| Package Height | 9.0 |
| Package Width | 3.5 |
| Product Type | Semi-Auto Pistol |
| Safety | Thumb |
| Shipping Weight | 7.3 |
| Sights | No Sights |
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