Individual firearm, such as a rifle, comprising: - a body wherein is made an operating compartment, having an abutment; - a barrel extending mainly along a barrel axis, between a free distal end for the exit of the firing forces of the cartridges, and an opposite proximal end, wherein is made a cartridge chamber, engaged with the body, said barrel sliding axially in relation to said body; - an automatic operating system for performing a cycle of opening, extracting the case of a fired cartridge and loading a new cartridge following the firing of the previous one, comprising: a) a carriage, housed in an operating compartment of the body, sliding axially in said compartment; b) an obturator associable with the proximal end of the barrel in a releasable manner, suitable to close the cartridge chamber; c) an elastic element, compressible between the carriage and the obturator; wherein in the configuration of firearm ready to fire with the bullet in the barrel, the obturator has a free compression stroke for the compression of the elastic element and the barrel has a free firing stroke between a limit forward position and the abutment of the operating compartment, wherein the free compression stroke is less than the free firing stroke; the firearm characterized by the fact that the elastic element comprises a plurality of Belleville springs at least partly stacked in parallel. - a body wherein is made an operating compartment, having an abutment; - a barrel extending mainly along a barrel axis, between a free distal end for the exit of the firing forces of the cartridges, and an opposite proximal end, wherein is made a cartridge chamber, engaged with the body, said barrel sliding axially in relation to said body; - an automatic operating system for performing a cycle of opening, extracting the case of a fired cartridge and loading a new cartridge following the firing of the previous one, comprising: a) a carriage, housed in an operating compartment of the body, sliding axially in said compartment; b) an obturator associable with the proximal end of the barrel in a releasable manner, suitable to close the cartridge chamber; c) an elastic element, compressible between the carriage and the obturator; wherein in the configuration of firearm ready to fire with the bullet in the barrel, the obturator has a free compression stroke for the compression of the elastic element and the barrel has a free firing stroke between a limit forward position and the abutment of the operating compartment, wherein the free compression stroke is less than the free firing stroke; the firearm characterized by the fact that the elastic element comprises a plurality of Belleville springs at least partly stacked in parallel. a) a carriage, housed in an operating compartment of the body, sliding axially in said compartment; b) an obturator associable with the proximal end of the barrel in a releasable manner, suitable to close the cartridge chamber; c) an elastic element, compressible between the carriage and the obturator; wherein in the configuration of firearm ready to fire with the bullet in the barrel, the obturator has a free compression stroke for the compression of the elastic element and the barrel has a free firing stroke between a limit forward position and the abutment of the operating compartment, wherein the free compression stroke is less than the free firing stroke; the firearm characterized by the fact that the elastic element comprises a plurality of Belleville springs at least partly stacked in parallel.