They used to be called "zip guns" or "Saturday night specials": Cheap, sometimes home-made firearms with mostly coincidental accuracy (You hit what you were aiming at? Pure coincidence!) and a penchant for exploding in the user's hand.
They're to mass-produced firearms what cheap bathtub hooch is to Jim Beam.
Wikipedia mentions them along with much more sophisticated designs:
I once watched a Vice documentary about Afghanistan, name escapes me at the moment, and they showed this blind guy making a replica of a Russian Makarov handgun by hand, with very basic tools. We used to manufacture revolvers before 3D printers, the industrial age, modern welding techniques, or pretty much most of the technology we enjoy today. The truth is, you can make a perfectly untraceable, very reliable, simple gun with out 3D printers.
They're to mass-produced firearms what cheap bathtub hooch is to Jim Beam.
Wikipedia mentions them along with much more sophisticated designs:
https://en.wikipedia.org/wiki/Improvised_firearm