Diamondback DB15 DB1721K061 | 5.56×45 & .300 BLK | 16″

The Diamondback DB15 combo (DB1721K061) is an AR-platform rifle package built on CNC-machined components with a focus on utility and modularity. It ships with a standard DB15 A3 flattop upper and a compatible upper chambered for .300 AAC Blackout, both sharing a 16″ 4140 chrome-moly barrel and a carbine-length gas system. The rifle features a 12″ M-LOK handguard, Magpul MOE carbine stock and grip, an A2 flash hider, and a thumb safety; it is made in the USA. For an optic under $1,000 that pairs well for short- to mid-range work, consider a Vortex Strike Eagle 1-6×24 for its versatile magnification range and durable construction.

Applications: range training and short-range hunting/field use with the .300 Blackout upper.

Product Specifications

• The manufacturer is Diamondback Firearms.
• The model is listed as DB15 Combo DB1721K061.
• The package includes calibers 5.56×45 NATO and .300 AAC Blackout.
• The action is Semi-Auto.
• The barrel length is 16″ on the supplied uppers.
• The barrel is made of 4140 chrome moly steel.
• The rate of twist is 1:8″.
• The capacity is 30 + 1.
• The unloaded weight is listed as 6.65 lbs.
• The overall length is 32.50″- 35.75″ depending on stock position.
• The stock is a Magpul MOE Carbine finished in black.
• The handguard is a 12″ M-LOK free-floating style.
• The muzzle device is an A2 Flash Hider.
• The safety is a Thumb style selector.
• The UPC is 810035752924.

This DB15 combo gives an owner two ready-to-fit uppers on a solid DB15 lower, delivering versatility for range work and short-range field applications. The inclusion of a .300 AAC Blackout-compatible upper alongside the 5.56×45 NATO configuration makes it a practical option for shooters seeking a two-caliber solution on one lower without sacrificing common AR ergonomics or accessory compatibility. Built with serviceable materials and Magpul furniture, it is a straightforward platform for further customization or optics mounting.

Related Videos: