Abstract: Permanent safety device for preventing the accidental firing of a weapon whose firing mechanism comprises a trigger, a hammer, a loaded spring which exerts a force along a given line of action on said hammer, retention means which hold the hammer in opposition to said spring and, inserted between the trigger and said hammer retention means, a lever which disengages these latter at the time of firing as a result of the trigger being pulled. The abovementioned firing mechanism includes a stop piece which can be moved between an interference position in which it interferes with the action of said spring on the hammer and a position in which it does not interfere with said action, and vice versa, and a mechanism, connected to the trigger, which is designed to move said stop piece out of said interference position only if the trigger is pulled.

Abstract: A tensioning device used for achieving mass-production interchangeability of the barrels for a shotgun with articulated barrels is positioned between the barrels and the breech of the gun and comprises a rod-shaped element constituted by a fixed portion and a movable portion guided for moving on the fixed portion and subject to the action of a powerful spring which urges it against a tenon. Means are provided for adjustably engaging the rod-shaped element on the tenon.

Abstract: A semi-automatic gas-operated shotgun includes a safety device which locks the firing mechanisms of the gun and simultaneously locks the breech-block slide in the open position, spaced from the cartridge chamber of the gun, by the operation of a single safety button.