The Medusa model 47 by Phillips & Rodgers
What an interesting revolver. It shoots just about ANY .38 caliber (which is equal to 9mm) ammunition out there, without any modification. Each cylinder has it's own extractor, rather than a star type for all 6, and it is this that holds in recessed rims like on the semi-auto ammo. Little fingers hold the cartridge for the firing pin to hit the primer
What a boon for those on a budget or as a survival gun that'll eat most anything you can scrounge out of a post necropalypse world, when the undead zombie walk the earth and outnumber the living 10,000 to 1.
There is a unique 9 (!) lands and grooves in the rifling of the barrel to make it easy to identify by forensics-ballistic types crime lab people. No other gun has that. Otherwise, the police might think, presuming someone used the revolver nefariously, that there were SIX different shooters, and guns belonging to same, to go with six different bullet types. Tricky!