Even now, after centuries of development and refinement, firearm technology is still evolving — and so the laws governing their usage are evolving too:

A was sentenced Monday to federal prison for manufacturing and trafficking "ghost guns" out of his Green Bay home.

Mitchell Guerrero, 30, was sentenced to nearly four years in prison and three years' supervised released for 3D printing the guns -- which lack serial numbers, making them impossible to trace.

Guerrero was creating the plastic guns in his basement.

When investigators raided the man's house, they found an absolute cache of printed firearms materials: Ammunition, magazines, an automatic conversion sear.

A ton of stuff, in other words, absolutely guaranteed to make the firearm narcs really angry. And the drug narcs, too, for that matter:

Investigators found evidence that Guerrero offered to sell ghost guns and traded one for methamphetamine.

Bad ideas all around. Authorities managed to successfully fire one of Guerrero's plastic handguns, and it also made its way through a TSA checkpoint without setting off an alarm.

Regardless of how you feel about the right to manufacture firearms without the government's approval, there's pretty much only one way a judge is going to respond to that sort of thing: