The Swedish K, 9mm submachine gun. It is also called the Carl Gustaf model 45. It is a very fine blowback operated full automatic submachine gun with a 36 round detachable box magazine. The stock folds to the side reducing the overall length from 31.8 inches down to 19.8 inches. The Swedish K fires from the open bolt position and has an effective range of approx 100 meters. It weighs 9.25 pounds with a fully loaded magazine and fires the standard 9mm parabellum bullet at a cyclic rate of 600 RPM. At the time of the Vietnam War, this weapon was the standard submachine gun in the Swedish Army.