Pistol firing device easily adaptable to different modes of operation, comprising - a frame on top of which a bolt slides, said frame comprising - a handle, which houses a magazine, - a trigger guard involving a trigger and - a metal back support for housing some of the components of the pistol firing device (1, 40, 50), wherein - said trigger is pivotly mounted to a first end of a rod, wherein an end of said rod opposite to the first end is located on the back support, - said bolt involves and houses a firing pin located on a rear side of said bolt and aligned with a chamber wherein a cartridge is located, - said firing pin has - around its front portion a firing pin spring, which acts on a stop and - on the rear portion of the firing pin a finger which projects downwards, - said rod having the shape of a laminar element and including on said opposed end to the trigger a tip and a crosswise arm, wherein said crosswise arm - is projected from a longitudinal body of the rod, towards a central portion of the pistol firing device (1, 40, 50) - has a rear surface, able to mechanically interact with said finger of the firing pin, and - has a flap on the front surface of the crosswise arm, facing the crosswise arm and projecting downwards, - said flap comprising in a central portion of said flap an oblong hole; said pistol firing device further comprising: - a rod guiding pin, fixed to the back support and with a guiding pin axle parallel to the length of the pistol firing device (1, 40, 50), wherein said rod guiding pin traverses the oblong hole of the flap of the crosswise arm, so as to limit the upwards and downward movement of said crosswise arm; and - a rod ramp in the form of an elongated laminar body, - fixed at a lower end to a crosswise axle and - on an opposite upper end having a fold projecting away from the center of the pistol firing device (1, 40, 50), thus defining a contact surface that mechanically works against the tip of the rod. - a frame on top of which a bolt slides, said frame comprising - a handle, which houses a magazine, - a trigger guard involving a trigger and - a metal back support for housing some of the components of the pistol firing device (1, 40, 50), wherein - said trigger is pivotly mounted to a first end of a rod, wherein an end of said rod opposite to the first end is located on the back support, - said bolt involves and houses a firing pin located on a rear side of said bolt and aligned with a chamber wherein a cartridge is located, - said firing pin has - around its front portion a firing pin spring, which acts on a stop and - on the rear portion of the firing pin a finger which projects downwards, - said rod having the shape of a laminar element and including on said opposed end to the trigger a tip and a crosswise arm, wherein said crosswise arm - is projected from a longitudinal body of the rod, towards a central portion of the pistol firing device (1, 40, 50) - has a rear surface, able to mechanically interact with said finger of the firing pin, and - has a flap on the front surface of the crosswise arm, facing the crosswise arm and projecting downwards, - said flap comprising in a central portion of said flap an oblong hole; - a rod guiding pin, fixed to the back support and with a guiding pin axle parallel to the length of the pistol firing device (1, 40, 50), wherein said rod guiding pin traverses the oblong hole of the flap of the crosswise arm, so as to limit the upwards and downward movement of said crosswise arm; and - a rod ramp in the form of an elongated laminar body, - fixed at a lower end to a crosswise axle and - on an opposite upper end having a fold projecting away from the center of the pistol firing device (1, 40, 50), thus defining a contact surface that mechanically works against the tip of the rod.