Don't try. The loss of rights to the law-abiding doesn't outweigh the theoretical gain of lowered violence. Gang members will kill each other no matter what gun control laws you pass, and mass casualty events like Orlando will continue to happen no matter what gun control laws you pass.
The overwhelming majority of gun control laws now being considered are either (A) pointless security theater akin to TSA checkpoints (restrictions on AR-15 like weapons), (B) unconstitutional violations of due process and other rights ("no fly no buy" list) or (C) sound good in theory but do little to solve the supposed issue (e.g. "universal" background checks).
If you want to do something that would actually be helpful WRT gun violence, then the stuff that I listed in my
post 21 would be a good start but thats premised on taking measures that are focused on the actual sources of gun violence. But I doubt theyll be taken up because we need to keep up the charade that everyone is equally capable of gun violence so that its not self-evident that were admitting that urban poor are the overwhelming majority of gun violence perpetrators. But we cant do that because it would seem racist so we gotta keep passing laws that do more to prevent the infinitesimal risk that some neurosurgeon from Kansas will purchase a 30 round magazine to shoot up a disco somewhere, rather than focus on the .25 pistol with low capacity magazine that drug dealers actually prefer for cost and size reasons to kill their rivals.