Save America and take all guns off the street.
The basic idea is to look at how other countries handle gun restrictions. Australia's laws on gun restrictions prevent gun fatalities.
One must provide a reason for owning a gun. Self defense is not a valid reason for owning a firearm. Firearms are essentially restricted to farmers, sportsman, government and police officials.
Handguns are restricted to only target shooters. Semi-automatic rifles and shotguns with small magazines are strongly restricted. Semi-automatic rifles and shotguns with larger magazines are essentially illegal and for government officials only.
Please read the wiki entry on Australia's gun laws to inform your decision to mirror a similar approach in the USA.