The sliding barrel located under the magazine is moved together with the forearm. The magazine has a modular design. The bore is locked in its extreme rear position by two spring-actuated catches that get activated once the trigger has been pulled. The gun is reloaded manually by pushing the slide forward-then-backward. The gun has a self-cocking hammer firing mechanism.The safety mechanism locks the trigger. Rys-F and Rys-K feature plastic pistol grips and forearms, as well as framed collapsible metal buttstocks.