It's happened before. P.A. Luty wanted to make a point about British gun control laws, so he built a submachine gun out of ordinary hardware store parts and wrote a book ("Expedient Homemade Firearms") containing detailed instructions. He got jailed over making these weapons, of course, but the point stands.
War brings out terrifyingly brilliant innovations from the strangest of places.
Having a better weapon doesn't stop a shitty weapon from killing you.
I guess that im just making an argument about the modern west.
Making bomb timers that lasted months/years to avoid detection was no mean feat in the early 80s