Nothing legislatively could stop what you are describing. That said, how many of these assault rifles used in these mass shootings were privately built or originally store bought? I'd be willing to bet most were the latter. I also doubt that douchebag from Sunday built all of his guns either. I completely get what you're saying though. I have a lot of friends and associates that build and mill guns and I agree that with the right mind and motivation a lot of this shit is impossible to stop.

I'm not saying a ban on assault weapons is the be all end all answer, but it's something, and something is better than the nothing we continue to do. Fuck... We can't even get background checks through. To me the whole argument that all the assault weapons will end up in the hands of bad guys and not the good guys is a stupid argument considering no one walks around with an AR15 waiting to fight off bad guys with AR15's. I don't hear of many home invasions using assault rifles either.