Agreed much too many. Good question, where are they getting them and how do we slow it down or stop it. Stop and frisk worked but was offensive in practice. What if all teens in all neighborhoods were subjected to it?
We're focused on the AR-15. Limits may be set for this type of weapon, which is not an automatic, nor an assault rifle (the AR are the first two letters in the original manufacturers name, ArmaLite Rifle. Like a handgun, it's semi-automatic (I think, but need input from real gun people). For everyone killed by one of these, hundreds are killed by the handguns.
I have no real answer here, better minds needed. I'm open to all ideas. I would like to see the impossible, anyone of age can own any weapon. A select, qualified, responsible few could have automatics. The rest of us could be banned from owning a weapon for legitimate reasons to be developed.