Diamondback DB15 Combo 5.56/.300 Blackout 16″ | DB1721K001

The Diamondback DB15 Combo pairs a 16-inch 5.56 NATO upper with a complete 16-inch .300 AAC Blackout upper, delivering two caliber options in a single package. Both setups use a carbine-length gas system and A3 flattop forgings, and the rifle ships with a 12″ M-LOK handguard, Magpul MOE carbine stock and grip, and a Gen2 30-round PMAG. For an optic under $1,000 that complements this platform, a Vortex Strike Eagle 1-6×24 offers a versatile magnification range suitable for typical AR-style engagements and short- to mid-range work.

Applications: range training and short-range hunting/utility using the .300 AAC Blackout upper (including suppressed setups where legal).

Product Specifications

• The UPC is 810035755079.
• The model is listed as DB15 and the product is sold as a Combo package.
• The package is chambered in 5.56 NATO and includes an additional complete upper chambered in .300 AAC Blackout.
• The primary barrel length is 16 inches for each upper assembly.
• The barrel description lists Chromoly steel with a Black Nitride finish.
• The rate of twist is 1:8 RH.
• The gas system for both uppers is a Carbine-length gas system.
• The bolt carrier group is a shot-peened, MPI Mil-Spec 8620 carrier.
• The upper is an A3 flattop forged 7075 T-6 aluminum assembly.
• The lower is a forged 7075 T-6 aluminum receiver.
• The handguard is a 12″ M-LOK free-float style.
• The stock is a Magpul MOE Carbine Stock and the grip is a Magpul MOE grip.
• The package includes Gen2 PMAG 30-round magazines and is shown to include 2 magazines.
• The muzzle device on each upper is an A2 Flash Hider (1/2 x 28).
• The overall length is listed as 32.50″ (collapsed) to 35.75″ (extended).

This DB15 Combo is configured to give shooters two factory-built upper options without modifying the lower: a 5.56 NATO configuration for general AR-style shooting and a .300 AAC Blackout assembly for short-range, heavier-bullet or suppressed applications. The included Magpul furniture and M-LOK handguard provide common, modular ergonomics and accessory compatibility found on modern sporting rifles.

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