Automatic weapon system

An automatic weapon system utilizing evacuation of a part of propellant gases from a barrel bore through a gas evacuation opening formed in a bore of a barrel comprising:

• a gas evacuation opening formed in a bore of a barrel for evacuation of propellant gases, a gas diverting/evacuation chamber, a barrel immobilizing device, a slide, a weapon frame with guides for guiding slide movement, a return spring mechanism of the slide and a breech,
• wherein the gas diverting/evacuation chamber is disposed at a near-bore space located at a barrel bore outlet, a front wall of the diverting/evacuation chamber located at the barrel bore outlet is attached at the barrel outlet and having a lower part resting on a weapon frame, an opposite rear wall of the diverting/evacuation chamber is formed by at least one bridge assembly having one end attached to the slide and another end sliding along the barrel, the bridge assembly formed by at least one substantially flat plate having an inner groove extending from the barrel to the frame and sliding along the barrel, the bridge assembly having at least one sealing gasket, the frame of the weapon serves as a lower part of the diverting/evacuation chamber,
• the slide serves as upper and side walls of the chamber, a downwardly directed projection provided at a front of the slide,
• the return spring mechanism of the slide for returning the slide to an original, forward position and a mechanism for pressing the slide to the frame,
• channels formed inside walls of the weapon frame functioning as guides for moving the slide in a backward direction, a downwardly directed ledge at each said channel at the barrel bore outlet to retain the slide in a front position,
• whereby, fixation lugs are provided at a bottom of a front area of the side walls for connecting the slide to the frame and to coordinate direction of a respective movement, said fixation lugs having a shape corresponding to a shape of the downwardly directed ledge formed in the channels, and streamlined sliding lugs are provided at a breech region,
• whereby in an initial, forward position of the slide, connections between the walls of the gas diverting/evacuation chamber are sealed, and when a bullet passes through the barrel bore at the gas evacuation opening formed in the bore of the barrel, the walls of the chamber are unsealed so to open the chamber.