This revolver is the smallest working one you will ever witness.
It actually fires a tiny 2mm pinfire cartridge.
Watch this video and see this tiny 2mm revolver shoot a soup can.
This undersized revolver fires a tiny 2mm pinfire cartridge. In this video, the shooter fires at point blank range and only dents a targeted soup can. It also appears the bullet may have ricocheted back and hit him in the hand from his quick reaction.
While this tiny revolver may have no knock down power we are certain in a dark alley it would bark enough to put a good scare into an attacker.