The Diamondback DB15 is a semi-automatic AR-15 style rifle chambered in 5.56 NATO / .223 Remington. Built on forged 7075-T6 aluminum receivers, it combines a 16-inch chrome moly vanadium barrel, direct-impingement operation, and a practical 30+1 capacity. With its flattop A3 upper, threaded barrel, M-LOK handguard, and familiar carbine-style controls, the DB15 offers a dependable, versatile platform for range use, sport shooting, and general-purpose rifle applications. Key Specifications * Caliber: 5.56 NATO / .223 Remington * Action: Semi-automatic, direct impingement * Barrel Length: 16 inches, medium profile, threaded 1/2x28 * Barrel Material / Finish: 4150 chrome moly vanadium with black nitride or Melonite finish * Twist Rate: 1:8 right-hand twist * Gas System: Carbine-length or mid-length, depending on the specific sub-model * Receivers: Forged 7075-T6 aluminum upper and lower with A3 flattop upper * Bolt Carrier Group: Shot-peened, MPI-tested Mil-Spec 8620 carrier * Handguard: Free-float M-LOK rail, typically 15 inches on standard rifle variants * Stock and Grip: Magpul MOE carbine stock and Magpul MOE grip * Overall Length: Approximately 36.25 inches extended SKU 325127 RR