Daniel Defense's large-frame AR-10 platform in .308 Winchester, the DD5 V4 brings DD's Cold Hammer Forged barrel and proprietary rail system to the battle-rifle format. The DD5 operates on a short-stroke piston system for reduced fouling. Type: Rifle Action: Semi-Automatic Caliber: .308 Win Capacity: 20 Year introduced: 2017, USA Weight: 128 oz Overall length: 38.75" Status: Active Intended use: Service, Law Enforcement, Long Range, Precision