Abstract: An extension device (1) of a firearm (500) mounts in an operating configuration, to a muzzle (555) of a barrel (550) of the firearm (500). The extension device (1) includes a main body (10) which has an inner element (11) housable inside the barrel (550) and suitable to firmly engage with an inner barrel wall (550?) and an outer element (12) which extends axially adjacent to the inner element (11) and is suitable to be arranged outside the barrel (550) with the inner element (11) housed in the barrel (550). The extension device further includes a secondary body (20) fitted axially on the main body (10) and an attachment body (30) fitted axially on the outer element (12) and fixable thereto performing an axial thrust action on the secondary body (20) until the secondary body presses against the muzzle (555) of the firearm (500).

Abstract: An extension device (1) of a firearm (500) mounts in an operating configuration, to a muzzle (555) of a barrel (550) of the firearm (500). The extension device (1) includes a main body (10) which has an inner element (11) housable inside the barrel (550) and suitable to firmly engage with an inner barrel wall (550?) and an outer element (12) which extends axially adjacent to the inner element (11) and is suitable to be arranged outside the barrel (550) with the inner element (11) housed in the barrel (550). The extension device further includes a secondary body (20) fitted axially on the main body (10) and an attachment body (30) fitted axially on the outer element (12) and fixable thereto performing an axial thrust action on the secondary body (20) until it closes in a pack on the muzzle (555) of the firearm (500).

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.