Looks like the frame is bent and welded sheet metal cut with a Dremel. The guide rods inside seem like cut down 3/8 inch rods. The barrel I’m guessing was either a pipe or hollowed out bolt based on the threading. Springs and that sort of thing can be found at most hardware stores.
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A $500 mill, some steel stock, hard work and the internet, and you too can make as many fully automatic firearms as you want.
If you don’t want to do that, a pipe, nail and a 2x4 will get you a nice single shot 12 gauge.
Guns aren’t really that hard to make, especially simple ones, you can reference the assassination of Shinzo Abe for an example
Looks like the frame is bent and welded sheet metal cut with a Dremel. The guide rods inside seem like cut down 3/8 inch rods. The barrel I’m guessing was either a pipe or hollowed out bolt based on the threading. Springs and that sort of thing can be found at most hardware stores.
Philip Luty would like a word with you in his shed…
My mom said no going into sheds with strangers.