An individual firearm with improved recock device comprising a casing (12), a barrel (13), a breech bolt (14), a breech bolt slide (15), wherein the barrel (13) has at least one hole (32), or gas bleeding port, communicating with a gas intake cylinder (19) which houses a piston gas intake assembly (20), which is connected to operating rods (31) integral to the breech bolt slide (15), comprises at least one first inertial spring (27, 27') arranged between the breech bolt slide (15) and the gas intake cylinder (19), adapted for causing a variable, inertial and/or gas intake actuation.