@Jerry Dryer
Re: " Dose  (sic) regulating gun accessories work...From what was learned so far from LV is he had large mags, bump stocks"  

He was in a room by himself away from anyone that could subdue him and considering you can swap a magazine in less than 3 seconds the capacity of the magazine would have made no difference. As far as the bumpstocks, you can bumpfire a semi automatic much more accurately and consistently with a rubberband or belt loop. Also if he had used a hunting rifle with a scope and bipod and chose his targets carefully I speculate it would have taken longer in a large, noisy crowd to realize what was happening and he would have killed more people but wounded fewer.