Abstract: A bolt (20, 20?) for locking the stock (11) to a receiver (12) of a firearm having mobile masses (13), comprising a tubular element (21) which can be closed at the ends respectively by means of a bolt-body cap (22) which can be screwed to the receiver (12) and by means of a bolt -stock cap (23) on which the stock (11) can be tightened, the tubular element housing in its interior a mechanism (40, 40?) for damping the withdrawal speed of the mobile masses (13) of the firearm, situated on their withdrawal trajectory and equipped with a free end not connected to the mobile masses (13) and destined for coming into contact with the latter during their withdrawal movement following the firing of the firearm for damping the stress.

Abstract: A cap group of a container pipe of a rifle comprises a manually removable closure latch having a main body, an engagement element, a spring and a socket. The group further comprises a cam profile joined to the container pipe, having a housing seat for the stable and manually reversible reception of the engagement element.

Abstract: A bolt (20, 20?) for locking the stock (11) to a receiver (12) of a firearm having mobile masses (13), comprising a tubular element (21) which can be closed at the ends respectively by means of a bolt-body cap (22) which can be screwed to the receiver (12) and by means of a bolt -stock cap (23) on which the stock (11) can be tightened, the tubular element housing in its interior a mechanism (40, 40?) for damping the withdrawal speed of the mobile masses (13) of the firearm, situated on their withdrawal trajectory and equipped with a free end not connected to the mobile masses (13) and destined for coming into contact with the latter during their withdrawal movement following the firing of the firearm for damping the stress.

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.