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The .300 AAC Blackout cartridge was designed to get the most out of a 16-inch barrel, and that is exactly what Diamondback gives you here. The DB15 wears a heavy-profile 4150 CrMoV barrel with a black nitride finish inside and out, cut with a 1:8 twist that stabilizes everything from fast 110 grain supersonics to heavy 220 grain subsonic loads. The muzzle comes threaded 5/8×24 with an A2 flash hider installed, so swapping to a brake or adding a suppressor later takes about a minute with a wrench. A pistol-length gas system keeps the short-action 300 BLK cartridge cycling the way it should.
Diamondback builds these entirely in the USA around a forged 7075-T6 aluminum A3 flattop upper and their DB15 carbon lower, which trims weight without giving up strength. The whole rifle comes in around 6.7 pounds, and the 15-inch free-float M-LOK handguard with anti-slip texture pads gives you real estate for a light, sling mount, or hand stop wherever you want them. Free-floating the barrel also does accuracy a favor, since nothing hanging off the handguard puts pressure on it. Magpul furniture rounds things out with an MOE grip and adjustable carbine stock that collapses the rifle down for storage or truck duty.
Diamondback ships this one with a Gen 3 Magpul PMAG built specifically for 300 Blackout, which is a nice touch. Dedicated 300 BLK mags feed the stubby cartridge more consistently than standard 5.56 mags, and the distinct look helps keep your ammo sorted if you run both calibers. The flattop upper comes without sights, leaving you a clean Picatinny rail to set up a red dot or low-power scope however suits your use.
For hog hunting in thick cover, deer inside 150 yards, quiet suppressed range sessions, or a capable rifle by the bedside, this DB15 covers a lot of ground for the money. It is a straightforward, well-equipped way into one of the most versatile cartridges on the AR platform.
Yes, the 1:8 twist barrel stabilizes both supersonic and heavy subsonic loads, which is a big part of the appeal of 300 Blackout. If you plan to run subsonics unsuppressed, just know some semi-autos can be picky about cycling the lightest loads, so it is worth testing a few brands to find what your rifle likes.
It is. The barrel comes threaded in the standard 5/8×24 pattern with an A2 flash hider installed from the factory. Remove the flash hider and you can mount a direct-thread can or a suppressor mount without any gunsmithing. Paired with subsonic ammo, 300 BLK is one of the quietest suppressed rifle setups you can build.
No, this model ships with a bare A3 flattop upper and no sights. That is common on rifles in this class and it leaves you a full-length Picatinny rail to mount a red dot, LPVO, or flip-up irons without paying for hardware you would swap out anyway. A red dot is a popular pairing given the practical range of the cartridge.
Standard AR mags will physically fit and often run fine, but dedicated 300 BLK magazines like the included Gen 3 PMAG 300 BO have geometry tuned for the cartridge and feed more reliably. They also look visibly different from 5.56 mags, which is a genuinely useful safety feature since a 300 BLK round chambered in a 5.56 rifle is a dangerous mix-up. Keeping dedicated mags for each caliber is the smart move.
| UPC | 810035756434 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | DB1718B002 |
| Action | |
| ATF Type | RIFLE |
| Barrel Length | 16" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Color | Black |
| Number of Magazines | 1 Gen 3 PMAG 300 BO |
| Package Height | 4.0 |
| Package Width | 9.0 |
| Product Type | Rifle |
| Shipping Weight | 8.5 |
| Sights | No Sights |
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