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Back in the day before the wall came down, pen guns (and a related suppressor) used to be issued to some folks. It was simply a refined version of the zip gun - which have been around forever.Had to look up what a zip gun was. Here is some info for those interested. No 3d printer needed.
Improvised Firearms (Zip Guns) - Like Grandpa Used to Make -
In Iraq, Afghanistan, Philippines etc you could find a lot of homemade weapons, some pretty crude and others fairly impressive.
I think @Good2Golf may remember my 9mm Makorov Pen gun in Afghanistan which was the Russian version of the item I mentioned above, albeit the Russians never opted for the suppressed option.
Necessity is the mother of invention.