Diamondback Firearms DB175AK621 DB15 5.56 NATO 16" 31-Round Rifle

The Diamondback Firearms DB175AK621 DB15 5.56 NATO 16" rifle is a reliable direct-impingement platform engineered for duty, sport, and home defense applications. Built on proven AR-15 architecture, this 5.56x45mm NATO rifle delivers the accuracy and dependability demanded by law enforcement, military personnel, and civilian shooters who require a lightweight, modular platform. At 8.4 pounds, the DB15 balances controllability with durability—critical for extended training sessions, tactical operations, or competitive shooting environments.

The 16-inch barrel provides optimal velocity and sight radius while maintaining a compact profile ideal for vehicle storage, apartment-friendly configurations, or rapid target acquisition in confined spaces. Chambered in 5.56 NATO—fully compatible with standard military 5.56×45mm and commercial .223 Remington ammunition—the rifle ensures access to abundant, affordable ammunition. The included 31-round magazine capacity exceeds most standard configurations, offering extended engagement time without reload operations. Direct-impingement operation minimizes moving parts, reducing maintenance demands while maximizing reliability across diverse environmental conditions and ammunition types.

This platform serves law enforcement duty carbines, military training programs, civilian defensive applications, and competitive three-gun shooters equally well. The modular Picatinny rail system accommodates optics, lights, laser devices, and other tactical accessories without permanent modification. The 16-inch barrel length complies with federal rifle regulations while the standard AR-15 ergonomics ensure compatibility with aftermarket triggers, grips, stocks, and charging handles. Shooters upgrading from pistol-caliber platforms or seeking a reliable 5.56 platform will find the DB15's consistent performance and straightforward maintenance accessible regardless of experience level.