The Franchi LF-57 is an Italian Submachine gun manufactured by Luigi Franchi S.p.A. in 1956, it was their first and only attempt at entering the submachine gun market. Designed for the Italian armed forces, it was only adopted by the Italian Navy in 1962. And even then, it was only made in limited numbers. However, the gun did not disappear entirely from the market until the late 1980s.
The LF-57 submachine gun is a blowback-operated, full-automatic-only weapon which fires from an open bolt. The bolt is shaped in a way resembling an inverted "L", with most of its mass being located above the barrel and in front of the breech face. The receiver, along with the pistol grip and magazine housing, is made from two stamped steel halves, left and right. The barrel is held at the front of receiver by a screw-on nut. There are no manual safeties on the gun, but an automatic safety is provided in the form of a large button, which is located below the trigger guard on the front of the pistol grip. The shoulder stock is made from thin steel tubing and folds forward and to the right. The weapon uses fixed sights.