No law or laws will ever stop mass killings.  Bump stocks are a red hearing and if anyone has ever played with a gun having a bump stock they will tell you very quickly accuracy is next to impossible.  Thank heaven the guy hadn’t sighted in his guns for long-range shooting and pulled the trigger one shot per pull.

Until our society comes to grip that we have sick individuals and deals with people instead of objects, this issue will continue.  For such a great society we have a lot of sick individuals.  No gun law will ever stop mass killings.  This guy could have just as easy hooked up a fuel tanker to an 18 wheeler and crashed it into a group of people igniting it.  Or based on his supposed knowledge of explosive blown up a building killing everyone in it.  There are lots of methods he could have used any number of options to have killed people.  Given this until our society takes steps in helping these people mass killings will continue.