The Diamondback DB15 Duo in .300 AAC Blackout (brand part no. DB1780B281) is a semi-automatic AR-15-pattern rifle built around a 16-inch barrel with a 1-in-8-inch twist, finished with B5 Systems Multi-Cam furniture. Diamondback Firearms feeds the DB15 Duo from an included Gen 2 PMAG with a 30-round capacity. Among AR-platform rifles in the semi-auto rifles category, the DB15 Duo favors shooters who want a suppressor-friendly .300 Blackout build.

Key Specifications

• Chambered in .300 AAC Blackout.
• Rate of twist is 1-in-8 inches.
• Operates as a semi-automatic AR-15-pattern rifle.
• Features a 16-inch barrel.
• Ships with one Gen 2 PMAG included.
• Magazine capacity is 30 rounds.
• Ships with no fixed sights, ready for an optic.
• Built with B5 Systems Multi-Cam furniture.
• Ships at approximately 8.4 pounds.

Frequently Asked Questions

What caliber does this rifle use? .300 AAC Blackout, a versatile subsonic-and-supersonic-capable cartridge.

What magazine ships with this rifle? An included Gen 2 PMAG with a 30-round capacity.

Buy the Diamondback DB15 Duo .300 Blackout

A suppressor-friendly .300 Blackout AR-15 is exactly what the DB15 Duo delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.