Diamondback Carbon DB15 Combo 5.56 NATO & .300 Blackout
Dual-caliber rifle combo featuring a 5.56 NATO lower with interchangeable .300 Blackout upper. 16-inch barrels, M-Lok rail, Magpul furniture, and two 30-round magazines included.
Diamondback Carbon DB15 Combo: Two Rifles in One
The Diamondback Carbon DB15 represents a practical solution for shooters who want versatility without the expense of purchasing two complete rifles. This combo package delivers exactly that—a single lower receiver paired with two complete upper assemblies, allowing you to switch between 5.56 NATO and .300 Blackout with nothing more than a few seconds of work.
What You Get
Main Configuration (5.56 NATO)
- 16-inch 4140 chrome moly barrel
- A3 Flattop upper receiver
- 12-inch M-Lok handguard for accessory mounting
- Carbine-length gas system
- Magpul MOE Carbine stock and grip
- A2 Flash hider
- 30-round Magpul magazine
Included Upper Assembly (.300 Blackout)
- Complete upper ready to install on the lower receiver
- Allows immediate caliber conversion
- 30-round Magpul magazine for .300 Blackout
Quality Construction
Diamondback Firearms employs CNC machining and quality materials throughout. The bolt carrier is shot-peened MPI Mil Spec 8620 steel, meeting military specifications for durability. Both configurations use carbine-length gas systems for reliable operation across various ammunition types.
Made in the USA
This rifle is manufactured domestically, supporting American manufacturing standards and quality control.
Ideal For
This combo works well for shooters who want to explore different calibers, those interested in subsonic .300 Blackout shooting, or anyone seeking a versatile platform without doubling their investment.
Features
- caliber: combo includes 5.56 nato and .300 aac blackout
- barrel: 16-inch with a 1:8 twist rate, black nitride finish
- construction: black hardcoat anodized 7075-t6 aluminum upper and lower
- gas system: carbine-length with mpi mil spec 8620 bcg
- receiver: a3 flattop, t-marked
- handguard: 12-inch m-lok for attachments
- grip: moe grip for ergonomic handling
- stock: moe carbine stock for comfortable shooting
- magazines: includes 30-round gen3 pmag for 5.56 and 300 blackout pmag
- muzzle device: a2 flash hider
- trigger: mil-spec for consistent performance
- weight: 6.3 lbs
- overall length: adjustable from 32 1/2" to 35 3/4"
