Daniel Defense DDM4 MK18 pattern in .300 Blackout. 10.3-inch barrel. Requires NFA registration. Combines MK18 compact platform with .300 Blackout subsonic capability. Type: Rifle Action: Semi-Auto Caliber: .300 Blackout Capacity: 30 Year introduced: 2019, USA Weight: 58.4 oz Overall length: 27" Status: Active Intended use: CQB, Defense, Suppressor Host