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The .300 Blackout cartridge was purpose-built for short barrels, and the DB-15 pistol takes full advantage of that. With an 8" barrel running a 1:8 twist, you're getting solid stabilization across the full range of .300 BLK loads, from lighter supersonic hunting rounds to heavy subsonic loads that pair seamlessly with a suppressor. The muzzle is threaded 5/8×24, which is the standard for .30-cal muzzle devices, so swapping on a suppressor mount or compensator is straightforward. The gas system is pistol-length direct impingement, keeping the overall package tight and cycling reliably with the short barrel setup.
Both the upper and lower receivers are forged from 7075 T-6 aluminum and finished in a black hardcoat anodize, giving this thing a durable foundation without piling on unnecessary weight. The Magpul MOE pistol grip is a comfortable, well-tested choice that most people already know and like. Up front, the 9" PC M-LOK handguard gives you plenty of rail real estate for a weapon light, laser, or grip accessory without making the package feel bloated. A flat-top Picatinny upper means you can run whatever optic you want, and since it ships without sights, you're not paying for something you'll pull off immediately.
The SBA3 stabilizing brace is one of the better choices Diamondback could have put on here. It's adjustable, low-profile, and comfortable against the forearm when shooting. The .300 Blackout cartridge genuinely shines in this kind of compact format, producing significantly more complete combustion from a short barrel than 5.56 would. Whether you're running it suppressed with subsonic 220-grain loads or pushing supersonic 125-grain rounds for range use, this setup handles both without any modifications needed.
The bolt carrier group is shot-peened and magnetic particle inspected to mil-spec, and the platform uses standard AR-15 controls throughout, so anyone already familiar with the AR pattern will feel right at home. It ships with one 30-round Magpul Gen M3 PMAG, and any quality .300 BLK-specific magazine will work as well. The whole package weighs in at approximately 5.7 pounds unloaded, which keeps it manageable even during extended range sessions. This is a Lipsey's exclusive configuration, designed and manufactured in the USA by Diamondback Firearms.
Yes. The 8" barrel is threaded 5/8×24, which is the standard thread pitch for .30-caliber muzzle devices and suppressor mounts. You will need to remove the factory flash hider before threading on a suppressor mount. The pistol-length direct impingement gas system is well-suited for suppressed use, and the .300 Blackout cartridge is one of the best options for running subsonic loads quietly through a can.
It ships with a 30-round Magpul Gen M3 PMAG, which is purpose-built for .300 AAC Blackout and is the recommended option. Standard AR-15 magazines can be used, but .300 BLK-specific mags like the Magpul PMAG 300 BO are preferred since they are optimized to feed the wider .30-caliber projectile reliably. Avoid using unmarked or off-brand magazines if reliable feeding matters to you.
No, it does not include factory-installed sights. The flat-top upper receiver has a full-length Picatinny rail that accepts any standard AR-pattern optic or sight. Most buyers run a compact red dot sight, which is ideal for the short-range applications this pistol is built for. If you want a backup option, Magpul MBUS flip-up sights are a popular and affordable choice for this platform.
The SB Tactical SBA3 is an adjustable, five-position pistol stabilizing brace designed to strap around the forearm and improve single-handed control on AR-pattern pistols. It locks into the same mil-spec buffer tube positions as a standard carbine stock, so adjusting length of pull is simple. It adds meaningful stability to an 8" pistol build without changing the ATF classification of the firearm.
The .300 AAC Blackout cartridge was specifically engineered to perform well from shorter barrels, making it a better fit for this format than 5.56 would be. You will see some velocity reduction compared to a 16" rifle barrel, but the cartridge still performs effectively for home defense and suppressed subsonic use. With subsonic loads in the 200-220 grain range, the 8" barrel is plenty sufficient and is arguably the most popular barrel length for suppressed .300 BLK builds.
Yes, Diamondback Firearms designs and manufactures the DB-15 in the United States. This specific configuration is also a Lipsey's exclusive, meaning it was spec'd out specifically for Lipsey's distribution and is not a standard off-the-shelf configuration from Diamondback's general lineup.
| UPC | 810035756557 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | DB191BB001 |
| ATF Type | Pistol |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Number of Magazines | 1 30rd. PMAG |
| Package Height | 3.6 |
| Package Width | 8.7 |
| Barrel Length | 8" |
| Action | |
| Shipping Weight | 6.95 |
| Sights | No Sights |
| Product Type | Semi-Auto Pistol |
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