Homemade Revolving Shotgun
Home Gunsmith forum user rhmc24 took parts from a 12 gauge shotgun and a 1857 Remington revolver and created a shotgun with a revolving cycle: Using chambers cut off 12 ga. scrap barrels and a new $10 bbl...
https://www.neatorama.com/2011/02/04/homemade-revolving-shotgun/