What about CNC milled gun files? Seems like a much bigger threat since mills capable of producing reliable firearms are probably orders of magnitude cheaper and

What about CNC milled gun files? Seems like a much bigger threat since mills capable of producing reliable firearms are probably orders of magnitude cheaper and far more ubiquitous than the necessary 3D printers. And of course thugs sell conventional mass-produced guns on the streets for another few orders of magnitude cheaper and more ubiquitous than CNC mills.