Designed by Austrian immigrant Joseph Joachim Reifgraber, this is a prototype gas-assisted short recoil pistol in a .38 rimmed revolver cartridge. While this version did not see any serial production, the Union Firearms Company of Toledo (Ohio) did market a slightly smaller model in .32 S&W (and .32 ACP). The gas-assist, as described in Reifgraber's patent, is used in this gun but not in the .32 model.