Silencer device for firearm

A method for silencing a firearm, in particular a rifle or another long or short firearm, when a shot is fired, the method comprising the following steps:

• temporarily sealing the barrel after ammunition has passed and preventing the passage of the combustion gases and the sound wave towards the mouth of the barrel when a shot is fired, by means of at least two closing flaps (10) mounted across the axis of the barrel of the firearm,
• forming a gas intake (1, 3) by means of at least one opening (1, 3) made in the barrel of the firearm upstream from the closing flaps (10),
• moving an actuation unit (2, 4, 5) and a control mechanism (6-9) by way of the combustion gases in the gas intake (1, 3);
• the control mechanism (6-9) including at least two amplitude lever arms (8, 12) mounted pivotably on pivots (7) attached to the barrel, each amplitude lever arm (8, 12) being coupled to either one of the closing flaps (10), and
• generating, by means of the actuation unit (2, 4, 5) and the control mechanism (6-9), a transverse movement of the closing flaps (10) between an open position, in which the closing flaps (10) allow ammunition to pass towards the mouth of the barrel, and a closed position, which prevents the passage of the combustion gases and the sound wave after the ammunition has passed,
• wherein the method also comprises the following steps:
• redirecting the combustion gases and the sound wave and allowing them to be discharged from the barrel by means of an exhaust unit (11, 21-27) including at least one exhaust pipe (11, 21) disposed on the barrel and upstream from the closing flaps (10), and,
• the actuation unit (2, 4, 5) including an activation piston, which is disposed in a cylinder (16) fixed to the barrel and is extended by a rod (2), moving the piston, extended by the rod (2), in a direction generally parallel to the axis of the barrel by means of the gas intake (1) made in the barrel.