Lady's home companion!
Possibly the worst revolver in the world...
Yes, revolver. I know it looks like the "Street sweeper" shotgun, because it was made by the same company (and mostly from the same parts as the shotgun.) Actually, it is chambered in .45-70 which you may recognize as the massively powerful cartridge in Fallout New Vegas or as the famous buffalo hunting cartridge that it was in real life.
So, the company basically made a massive and complicated 12 shot revolver. Unfortunately this revolver is as unwieldy as the "Street sweeper" shotgun and apart from sharing the same awkwardness and unreliability as the other model the "Lady's companion" also suffers from the fact that by trying to reuse parts from the other model they have created new problems with this gun. Like the fact that the ejector rod does not seem to work because the chambers usually don't align correctly...