Nikolas Cruz did not use a bump stock at Parkland, but Stephen Paddock did in Vegas, and even most Second Amendment stalwarts seemed to agree at the time that you don't need a bump stock - which is basically an add-on making a non-automatic rifle function like an automatic - in order to exercise your right to keep and bear arms.
So when President Trump announced on Tuesday that he wants the Justice Department to issue regualtions effectively banning them, that would seem if nothing else to be a minimal move everyone could get behind. But remember, gun control is about politics, not about preventing mass murder. Nothing can be a good idea if the NRA doesn't object to it: