The AG36 (German: anbaugranatwerfer, English: attached grenade launcher) is a grenade launcher produced by Heckler & Koch of Germany for the G36 assault rifle. It fires 40mm grenades and has a lateral swing-out breech that allows it to load longer grenades than traditional forward-opening launchers such as the American M203. The launcher was the basis for the M320 grenade launcher, which is an AG-36 variant designed for the XM8 rifle (and later the HK416) with a folding stock and grip to meet US Military requirements.