 if you haven't heard what happened. But for anyone that needs a refresher, Donald Trump was speaking at a rally last Saturday in Pennsylvania when a gunman shot at him, killing one spectator and clipping Trump in the ear. And the response? Outrage, condemnations and prayers on all sides. NPR has done a lot of coverage on the response. But as far as I can tell, there's been less chatter about the gun. And this gun has a lot of symbolism. The AR-15.