Should we remind them their own department of war once published [tm 31-210](https://en.wikipedia.org/wiki/TM_31-210_Improvised_Munitions_Handbook), that happens to have mindnumbingly simplr gun making instructions with pictures? If sb wants to make a gun and doesn't give a fuck about laws, they'll make it not only regardless of unenforceable restrictions, but even regardless whether or not they have a 3d printer.