The original 19th century vest-sized pocket pistol was the Philadelphia Deringer. The advent of the metallic cartridge gave us the classic double barrel .41 Rimfire Remington Model 95 which achieved such widespread popularity, that it has completely overshadowed all other designs, becoming synonymous with the word "Derringer". The Remington double-barrel derringer design is still being manufactured (150 years after they were first introduced) by American Derringer, Bond Arms, and Cobra Arms, all of whom manufacture derringers in a variety of calibers from .22 long rifle to .45 Long Colt & .410 gauge.