It’s becoming a thing, police don’t like to report on it because they don’t want to give people ideas. They didn’t want to report on Glock switches either. I do machining as a hobby and am interested in machining guns from an academic challenge perspective, I’ve not done it because I focus on making things I can’t buy. Guns from an academic perspective are fascinating, we’ve been making them for a long time in just about every possible way, and there is an easy way to measure and communicate quality, I.e. does it shoot and how accurate is it. I think the ban is absurd, the tech to make 3D printers / CNCs is pretty generic and someone sufficiently motivated to make a gun is unlikely to have difficulty putting together the machines to do it.