The Daniel Defense MK18 is the civilian version of the USSOCOM Close Quarter Battle Receiver, featuring a 10.3-inch barrel and carbine-length gas system built to the original CQBR specification. Type: Pistol Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2018, USA Weight: 84 oz Overall length: 25.75" Status: Active Intended use: Tactical, Home Defense, Law Enforcement