All these already exist in Calif (and several other states) yet have done nothing to curb gun violence or mass shootings.
And what do you mean by banning semi-auto's except to individuals? I have semi-auto rifles and handguns (as most pistols are) with Calif legal magazine capacities yet I can re-load them rapidly from as many pre-loaded 8 round (10 rounds in the case of a rifle) magazines in less then a second - thus firering many many rounds rapidly. So I don't understand the need to ban a certain type of firearm or even limit the magazine capacity to prevent a rapid fire mass shooting kind of situation. The same thing can be done with most any handgun. And as other's have pointed out in different threads - carrying several handguns and many magazines is easily concealable.
ETA: I finally caught up with all the posts and see that several other's mentioned the ease to to cahnge out mags fast. Also I understand Bicker meant "ban semi-autos for all individuals - not except for them. Next time I'll read it all before posting. I know..I say that every time and never do ;-)!