Props for ingenuity go to the Chinese hobby gunsmith known as “God pig”, who cobbled together a shotgun revolver. It’s like a twelve-gauge version of Taurus’ “The Judge”. (I love the Beretta logo and the “Made in USA”.)
I save such examples of garage gun manufacturing for whenever some chowderhead tells me that banning guns gets rid of them. Unless you outlaw all materials and tools you can use to make guns, and you erase all the knowledge of metallurgy and chemistry from peoples’ brains, getting a gun is just a question of wanting one badly enough, buying $50 worth of simple tools, and borrowing a book or two from the library.