James of Hell in a Handbasket spotted this photo on a Peruvian travel blog. It is homemade percussion lock gun. The owner apparently uses homemade gun powder (not hard to do … but kids don’t try this at home).
If you have read this blog for a while, you know how much I like examining homemade guns 
Smooth bore or rifled? Probably smoothbore, looks like a pipe for a barrel.
More info about the gun at Hell in a Handbasket.
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Have you explored P.A. Lutty’s site on home made SMG’s? Apparently you can make them with hand tools.
http://www.thehomegunsmith.com/index.shtml
If you like home-made firearms, his is a place to check out.
Black powder rifle barrels used to be made by heating and then winding heavy gauge wire around a rifled mandril and then pounding it into shape on a anvil. The mandril can be made on any kind of simple engine lathe and is usually reusable. This is where hexagonal shaped barrels come from. Hammer on top against a flat surface, then rotate and repeat. But this one probably is just a pipe.