Impose effective and sensible gun regulations.

Guns individually titled just as cars are titled. This would discourage straw purchasers from supplying criminals with guns.
A federal requirement that all guns, regardless of the gun owner's domestic situation, be secured in a lockable gun safe.
Pistols and semi automatic weapons, with exception of shotguns with no more than a 4 round magazine, have the most regulation in much the same way as fully automatic weapons are, background check by the ATF/FBI, fingerprinting of the owner and a high tax to discourage casual use.
A high tax on ammunition purchased by individuals. The exception would be ammunition purchased and used at public and private gun ranges and clubs.
A Federal buyback program of up to $1000 per working weapon to help rid the streets of the ridiculous number of weapons