The Diamondback DB15 in .223 Rem/5.56 NATO (brand part no. DB1717K004, model DB15USLB) is a semi-automatic AR-15 built around a military-proven direct gas-impingement system, pairing a 16-inch 4150 chrome-moly Melonite-coated barrel with a 1:8-inch twist rate. Diamondback Firearms runs a carbine-length gas system with a black hardcoat-anodized 6061-T6 aluminum gas block, tops the rifle with an A3 flattop forged 7075-T6 aluminum upper over a matching forged 7075-T6 lower, and mounts a standard two-piece handguard. An A2-style pistol grip, a 6-position mil-spec buttstock, and a manual thumb safety round out the build. The muzzle is threaded 1/2×28, and the rifle ships optic-ready with a 30-round aluminum mil-spec magazine. Among AR-platform rifles in the AR rifles category, the DB15 favors shooters who want CNC-machined build quality at an affordable price.

Key Specifications

• Chambered in .223 Rem/5.56 NATO.
• The barrel carries a 1:8-inch rate of twist.
• Features a 16-inch 4150 chrome-moly barrel with a Melonite coating.
• Runs a carbine-length gas system.
• Built on forged 7075-T6 aluminum upper and lower receivers.
• The muzzle is threaded 1/2×28.
• Fitted with an A2-style pistol grip and 6-position mil-spec buttstock.
• Uses a manual thumb safety.
• Ships optic-ready with no fixed sights.
• Includes a 30-round aluminum mil-spec magazine, weighing approximately 6 pounds.

Frequently Asked Questions

What gas system does this rifle use? A carbine-length direct gas-impingement system.

Does this rifle come with sights? No, it ships optic-ready without fixed sights.

Buy the Diamondback DB15 Carbon 5.56 NATO

CNC-machined build quality at an affordable price is exactly what the DB15 delivers. As soon as it is ready to ship, order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.