Utilitarian engineering, ultra-reliable function, and enhanced accuracy characterize all models of the HK 40 mm grenade launcher family. Combat-proven designs, Heckler & Koch grenade launchers use simple break-open actions and rifled barrels. These lightweight launchers fire a variety of low velocity ammunition, including CS, HE, AP, less lethal, and flares to ranges of 400 meters with a degree of accuracy not available from competing designs. More that 30,000 Heckler & Koch grenade launchers have been in service since 2000 with the military forces of Britain, the Netherlands, Spain, Germany, and Portugal.