Diamondback DB15 5.56 / .300 AAC Blackout Pistol Combo

The Diamondback DB15 pistol combo is built for shooters who want caliber flexibility and a compact AR-style platform for range and practical use. This package pairs two complete uppers—one chambered in 5.56 NATO with a 7-inch barrel and one chambered in .300 AAC Blackout with a 10-inch barrel—on a forged 7075-T6 lower for multi-role capability.

Constructed with forged 7075-T6 aluminum receivers and robust barrel materials, the DB15 combo balances durability and compact handling. The set includes M-LOK handguards, Magpul-style grip, A2 flash hiders, and Magpul 30-round magazines to provide a ready, modular pistol configuration for training and range work.

Key Specifications

• The caliber(s) are 5.56 NATO and .300 AAC Blackout.
• The 5.56 upper uses a 7-inch pistol-length 4150 Chrome-Moly barrel with a black nitride finish.
• The .300 AAC Blackout upper uses a 10-inch 4140 chrome-moly free-float barrel with a black nitride finish.
• The gas system for each upper is a pistol-length gas system.
• The bolt carrier group is a shot-peened, magnetic particle inspected Mil-Spec 8620 carrier.
• The receivers are made from forged 7075-T6 aluminum.
• The handguards are equipped with 6-inch and 9-inch M-LOK rails for accessory mounting.
• The capacity is 30 + 1 rounds using included magazines.
• The muzzle device on each upper is an A2 flash hider (1/2-28 tpi).
• The rifling twist rate is 1:8 right-hand.

This DB15 pistol combo is supplied with two complete upper receiver groups and magazines for immediate use and modular training options. Buy the Diamondback DB15 5.56 / .300 AAC Blackout online today to add a versatile, compact AR-style pistol to your collection.