by I had heard Michael Bane make reference to the Ithaca Auto & Burglar shotgun pistol but had never seen one. Ian McCollum of Forgotten Weapons shows two examples of these any other weapons that are up for auction at Rock Island Auctions.
While these would have been a beast to handle in 12 gauge, in the lesser gauges like 20 or 28, I think they’d still provide more than adequate protection against highwaymen and carjackers.