The Diamondback DB15 .300 Blackout pistol (brand part no. DB1984B001) comes from the Obsidian Series and pairs a 10-inch barrel with an SB Tactical SBA5 brace in a compact, black-anodized package. Diamondback Firearms gives it a pistol-length gas system, a 9-inch V4 M-LOK anti-rotation S-Rail handguard and a DB Obsidian muzzle brake threaded 5/8×24. A Magpul MOE K2 grip and a Magpul Gen M2 PMAG with 30 rounds round out the setup. It is an easy pick for a short, handy .300 Blackout pistol that is ready for subsonic or supersonic loads at the range or around the property.

Key Specifications

• Chambering is .300 Blackout, a short-barrel friendly cartridge that runs in standard AR-15 magazines.
• The barrel is 10 inches with a 1:8 right-hand twist, a rate that stabilizes both light and heavy bullet weights.
• The barrel is medium-profile 4150 CrMoV with a black nitride finish for durability.
• A DB Obsidian muzzle brake threaded 5/8×24 sits on the muzzle to tame recoil and muzzle rise.
• The gas system is pistol length, matched to the short barrel.
• The handguard is a 9-inch M-LOK V4 anti-rotation S-Rail with a full Picatinny top and QD mounts for slings and accessories.
• The brace is an SB Tactical SBA5, giving the pistol a supported shooting platform without a stock.
• The grip is a Magpul MOE K2, and the lower includes a Magpul MOE enhanced trigger guard.
• One Magpul Gen M2 PMAG with 30 rounds is included.
• Weight is 6.25 pounds and length is 28.25 inches, with a black anodized finish and no iron sights.

Frequently Asked Questions

Is this an AR pistol or a short-barreled rifle? It is a pistol. The 10-inch barrel carries an SB Tactical SBA5 brace rather than a shoulder stock, and Diamondback lists it with its DB15 AR pistols.

What muzzle device does it use? It uses the DB Obsidian muzzle brake, threaded 5/8×24, which is the thread pattern used by many .300 Blackout muzzle devices and suppressor mounts.

Does it come with iron sights? No. Diamondback lists the sights as none, so the flat-top upper is ready for your own optic or backup sights.

Buy the Diamondback DB15 Obsidian Series Pistol, .300 Blackout, 10-Inch, Muzzle Brake, SBA5 Brace, 30-Round

A compact .300 Blackout pistol with a brake, brace, QD-ready handguard and 30-round magazine already in place saves you the parts shopping. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, then look through more semi-auto rifles for your next build.