This buckle pistol, created in the 30s of the last century in Nazi Germany.
Since the scope of use buckle pistol was very limited, they were released quite a bit.
Running the whole thing is very simple.
There are two types of buckles, guns - and dvuhstvolny chetyrehstvolnaya (7, 65 and 5, respectively, 6-gauge).
By pressing the button, the top of the buckle opens and immediately be shot.
In other models, after opening the buckle must still pull the trigger.