Daniel Defense DDM4A1 RII is a 5.56mm NATO AR-15 style carbine with a 14.5 inch M4-profile barrel, pinned and welded muzzle device, and a rugged free-floating quad-rail handguard designed for serious accessory mounting. It features a carbine-length gas system and 1/2 x 28 muzzle threads for common muzzle devices. The rifle has a Picatinny top rail for optics and accessories, and comes with a 32-round Daniel Defense magazine and a Daniel Defense full-latch impact plastic case. Firearm specifications include caliber 5.56mm NATO, barrel length 14.5" with pinned and welded muzzle device, overall length 31.5"–34.75" (with muzzle device), sights None, and Grips/Stock DD Furniture.