DIAMONDBACK DB15 5.56 NATO SEMI-AUTO RIFLE W/300 BLACKOUT UPPER

The Diamondback DB15 Combo Kit delivers multi‑caliber versatility in a reliable Modern Sporting Rifle (MSR) platform. This package includes a fully assembled DB15 rifle chambered in 5.56 NATO along with an additional fully assembled .300 AAC Blackout upper, allowing shooters to change calibers quickly while retaining the same lower receiver, controls, and ergonomics.

Built on forged 7075‑T6 aluminum receivers, the DB15 features a proven direct‑impingement operating system, a free‑float M‑LOK handguard, and quality Magpul furniture. Whether configured for 5.56 NATO or .300 AAC Blackout, this combo offers flexibility for range use, training, and general sporting applications.

FEATURES

• Two‑caliber combo package with interchangeable uppers
• Fully assembled 5.56 NATO rifle (installed)
• Additional fully assembled .300 AAC Blackout upper
• 16” chrome‑moly barrels on both uppers
• Forged 7075‑T6 aluminum upper and lower receivers
• 12” free‑float M‑LOK handguards
• Carbine‑length gas system
• A2 flash hiders
• Magpul MOE carbine stock and pistol grip
• Single shared bolt carrier group (BCG) and charging handle

SPECS

• Action: Semi‑Automatic
• Platform: AR‑15 / Modern Sporting Rifle
• Operating System: Direct Impingement
• Capacity: 30+1 (where legal)
• Twist Rate: 1:8 RH
• Finish: Black, Hard Coat Anodized
• Handguard: 12” M‑LOK
• Stock: Magpul MOE Carbine
• Grip: Magpul MOE
• 5.56 NATO Upper
• Barrel Length: 16”
• Barrel Material: Chrome‑Moly, Black Nitride
• Muzzle Thread: 1/2x28
• Muzzle Device: A2 Flash Hider
• .300 AAC Blackout Upper
• Barrel Length: 16”
• Barrel Material: Chrome‑Moly, Black Nitride
• Muzzle Device: A2 Flash Hider