The Carl Gustav M/45, also known by its nickname the Swedish K, is a Swedish submachine gun developed by the Carl Gustafs Stads Gevärsfaktori (English: Rifle Factory of Carl Gustaf's town) state arsenal in 1945. The weapon was the standard submachine gun of the Swedish Army from 1945 to the late 1990s, when it was phased out in favor of the Ak 4 assault rifle. The weapon saw considerable use by US Navy SEALs during the Vietnam War, who favored its ability to fire immediately after leaving water.