Diamondback DB15 Carbon Series .300 AAC Blackout AR-15 Rifle – 16" Nitride Barrel, Free-Float M-LOK Rail
The Diamondback DB15 Carbon Series brings .300 AAC Blackout performance to a lightweight AR-15 platform built entirely in the USA. A forged 7075-T6 receiver set, 16-inch 4150 CrMoV nitride barrel, and 15-inch free-float M-LOK handguard give this carbine solid accuracy potential and modern accessory flexibility. With its factory-marked “300 AAC” dust cover, six-position collapsible stock, and Magpul MOE grip, this rifle is ready for range work or hunting right out of the box.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Good – Clean, well-maintained, minor wear marks.
Rifling Condition: Good – Intact, well-defined lands and grooves.
Specific Condition Notes: Minor superficial scratches and blemishes are visible on the exterior surfaces. The bore remains clean and shiny.
What’s Included
- Diamondback DB15 Carbon Series rifle
- Three 30-round Magpul PMAG Gen M3 polymer magazines marked “300 BLK / 7.62×35”
The DB15 Carbon Series is built on a forged 7075-T6 aluminum upper and lower, both finished in a durable matte black hard-coat anodizing and marked with Diamondback’s “DB” shield logo. The upper features a flat-top A3 profile with a continuous Picatinny rail for easy mounting of sights or other accessories.
Accuracy is supported by a 16-inch 4150 CrMoV steel barrel with a 1:8 twist, optimized for the wide bullet weights common in .300 AAC Blackout. The barrel’s black nitride treatment enhances corrosion resistance and wear life, while its medium profile balances rigidity with manageable weight. Standard 5/8x24 muzzle threads make adding a compatible device straightforward.
The 15-inch free-float aluminum M-LOK handguard gives shooters generous attachment real estate without adding unnecessary bulk. Lightning cuts reduce weight and improve heat dissipation, and the free-float design prevents handguard stress from influencing barrel harmonics.
Controls follow the familiar AR-15 layout, including a manual safety selector with FIRE/SAFE pictographs, forward assist, brass deflector, and hinged dust cover. The collapsible six-position stock and Magpul MOE grip provide an ergonomic, adjustable fit for a wide range of shooters.
Chambered in .300 AAC Blackout and paired with three dedicated PMAGs, this DB15 Carbon Series rifle offers a turnkey solution for anyone looking to take advantage of the caliber’s versatility in a proven direct-impingement platform.