I would assume that in a country where guns are highly regulated, ammunition is as well. What good does it do to be able to print a gun if it's very difficult to get ammunition for it? You might be able to make a serviceable gun from plastic, but you can't make gunpowder from it.

If ammunition is hard to come by, then a few logical alternatives are:

Forget about guns and build a bomb instead. Unlike guns, which require gunpowder to work, bombs can be built using any number of explosive substances from gasoline to kitchen matches.

Build a compressed air powered gun. The reason air/CO2 powered guns are usually considered toys instead of genuine firearms is that they're designed to shoot small, non-penetrating ammunition (BBs and pellets). A homemade air gun designed to shoot a sharpened dart would be as deadly as any conventional firearm at an appropriate range. All you'd need would be a suitable compressed air source and some PVC pipe.

Go to a junkyard, get a couple of leaf springs from an old truck, and build a crossbow.


If one's goal is to circumvent a country's laws and regulations to create a death-dealing device, there are much easier ways to do it than dashing off a copy of a gun with a 3D printer.