Recoil system for firearms

The invention relates to a device (1) for simulating the recoil of a firearm, which is converted as a laser weapon for practice purposes and has a closure (60) which can be moved back and forth between a closed starting position and an open end position with a knock-out slide (63). There is provided a control mechanism for controlling a hydraulic working piston, which is directly or indirectly in operative connection with the closure (60) of the firearm, wherein the working piston can be acted upon by a hydraulic medium and in a closure (60) from its initial position to its end position moving Working position is adjustable. Furthermore, a valve pressure lever (11) is provided, which is deflectable by an adjusting movement of the slide-off slide (63) and causes an opening of a pressure valve (20), whereby the working piston Hydraulkmedium can be supplied under high system pressure. The pressure valve (20) is in communication with a hydraulic chamber receiving hydraulic chamber (13) which has a movable separating piston (14) which separates the hydraulic chamber (13) tightly from a first gas pressure chamber (17) filled with a pressurized gas causing the system pressure. wherein the separating piston (14) is acted upon by the pressurized gas with system pressure. The working piston indirectly or directly at the end of its adjusting movement causes the closing of the pressure valve (20) and at the same time or with a delay the opening of an outlet valve,