The Bär pistol was designed as a compact gentleman’s defensive arm with a number of interesting features. These include twin barrels and a “cylinder” or chamber block, which held 4 cartridges in a single column, thus giving the pistol a smooth-sided shape easy to conceal while also giving it double the capacity of a typical double-barreled derringer. Some were made in a proprietary 7mm cartridge, but this one (like most of them) is chambered for the .25ACP (aka 6.35mm Browning).