Invention refers to the armament industry, namely to percussion firing mechanism of the pistol and according to the invention, the barrel is moving inside the frame parallel to the slide axis only, at that the cartridge is located in the magazine in alignment with the barrel, the hammer is performed with firing pin located in the slide lateral channel and has the ledge directed upwards to interact with the hammer spring and the ledge, directed downwards to interact with pistol trigger mechanism, at the rear part of the slide, under the hammer the port is performed, which contains the hammer spring module, located in case, which is fixed at the front part of the slide port by means of catches and by means of the cross pin at the rear part and contains the tube-form extractor with collar for the interaction with hammer ledge, at that the front end of the guide is inserted in extractor lateral hole, but its rear end intrudes in the hole, performed at the guiding socket base, the hammer spring, located inside the guiding socket between the guiding socket base and extractor collar, grips the guide and extractor and the ends of the guide are inserted into the module case walls holes, therewith the firing mechanism contains the automatic safety device, ledge of which, driven by the safety device spring intrudes into the hammer notch, providing its lengthwise displacement inability. The invention allows improving the pistol operation durability due to the cartridge jamming against the barrel breech face possibility elimination, and to ensure maintenance, disassembly, cleaning ease due to the firing mechanism components, located in the quick-release module of the slide.