Sure there are. We know that lots of mass shootings are committed by people who go buy assault weapons and entire arsenals legally, even though there are multiple obvious red flags that should have prevented it. A lot of these people, to put it rather mildly, are not the sharpest knife in the drawer. Even very basic legal provisions would keep them from getting those guns. They'd then have to get them via means that make it a lot more likely for them to get caught.
We KNOW this from page after page of examples where sensible gun laws immediately decreased gun violence, in short order.
We KNOW this from page after page of examples where sensible gun laws immediately decreased gun violence, in short order.