 This linear hammer enters the hollow bolt and drives a free-floating firing pin forward with each shot.The vz.58 uses a trigger mechanism with a lever-type fire mode selector, which is also a manual safety against accidental discharge.When the selector lever is placed in its rear position ("1"—single fire) the sear is disabled and the left hammer catch is rotated by the disconnector, which is depressed by the bolt carrier after every shot and is therefore disconnected from the hammer catch.