The M320 Grenade Launcher Module replaced the M203 as the US Army's standard underbarrel grenade launcher. Can be used standalone with a folding stock or mounted under the M4/M16 series. Features a side-opening breech for faster reloading. Type: Grenade Launcher Action: Single-Shot Caliber: 40x46mm SR Capacity: 1 Year introduced: 2009, Germany Weight: 3.3 oz Overall length: 15" Status: Active Military use: Yes Intended use: Military, Squad Support