Every time I see one of these stories I wonder how many tools I would have to remove from my garage to make it impossible to build a primitive gun in there. With enough ingenuity I'm really not sure there would be anything left.

https://en.wikipedia.org/wiki/Philip_Luty#Firearms_design

> one particular design, outlined in his book Expedient Homemade Firearms, is the best known. This design makes extensive use of easily procured materials such as folded sheet metal, bar stock, washers, and hex screws. It is a simple blowback-operated sub-machine gun and entirely made from craft-produced components, including the magazine and pistol grip. The major drawback of such designs is the lack of rifling in the barrel, which results in poor accuracy and limited range

This book was openly sold on Amazon 10 years ago. I still have one on my shelf.

Wasn't the whole point of the Sten gun that it could be made out of readily-available materials (steel plumbing pipe mostly) with simple hand tools, and really only needed two of the 50 or so components to be machined?

So, unless your garage is down to a pair of rusty pliers and a dried-out Biro then you're probably still up there.

Do potato cannons count?