Abstract: Firing device includes a fire arm which includes a cartridge carrier in the loader in front of the entry of the barrel and supported against a supporting element of the casing which includes the firing mechanism and whereby the barrel slides in the casing into a position in which the barrel comes to a stop through the action of a return spring against the front part of the case of the cartridge, and wherein each cartridge is provided with propulsion arrangement to project the case and is the barrel forward.