2mm Kolibri
The 2mm Kolibri was the smallest commercially available centerfire cartridge, patented in 1910 and introduced in 1914 by Franz Pfannl, an Austrian watchmaker, with financial support from Georg Grabner. Wikipedia
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May 5, 2017 · The 2mm Kolibri (or hummingbird) is the smallest pistol ever created, also firing the smallest commercially available cartridge, the 2.7x9mm ...