You don't need 3-D printers to make guns. They can be quite easily made in any machine shop - albeit with varying degrees of success. Zipguns / improvised fire

You don't need 3-D printers to make guns. They can be quite easily made in any machine shop - albeit with varying degrees of success. Zipguns / improvised firearms have been a thing for a long time -> http://en.wikipedia.org/wiki/Improvised_firearm http://en.wikipedia.org/wiki/Improvised_firearm Gunpowder is pretty easy to make as well. Stop whining about 3-D printers it's not that big of a deal in regards to guns.