How about, elimination of the sale of assault weapons, making 'bump stocks' or kits to make assault weapons fully automatic a possession/sale felony, and restrictions on the number and/or types of guns one can legally own.  
Then to prevent any number of other gun deaths we should legislate stricter background checks, restrictions on silencers, stronger sentencing for the illegal possession or sale of guns, buy back plans, implementation of licensing requirements to purchase, much stronger regulation of internet and gun show sales, continuation of trigger lock give aways, insurance requirements for gun ownership, and on and on and on.