This weapon was created in the 30s of the last century in Nazi Germany. Since the area of use of the pistol buckle was very limited, quite a few of them were released. The whole thing works very simply. There are two types of pistol buckles - double-barreled and four-barreled (7, 65 and 5, 6 caliber, respectively). When the button is pressed, the upper part of the buckle opens and the shot immediately follows. In other models, after opening the buckle, you must also pull the trigger.