Falling- and Vertical breech block – Vertikal Verschlüsse (Falling block). The vertical breech moves vertically up and down inside the receiver of the pistol and does not pivot. It has a fixed barrel. When the loading lever is actuated the vertical breech drops downwards, extracting any empty case and allowing it to be loaded. In the reverse action, the breech is raised, locking the pistol and it is ready to fire. The breech can either house an internal or external hammer.