“In this video I show a gun that I built out of simple parts bought from the hardware store, no background check required,” awesomeairguns.com writes underneath his latest bid for YouTube glory. “With all of the talk lately about 3D printed guns, I just thought I’d point out that it has been possible for a while to build a gun at home.” Only since the 10th century. And this isn’t exactly the most concealable of weapons. Still, point taken.