Personally? I love my guns, I love my country, but I would make it a point to add a new license into the works, if you want to buy anything more concealable or high powered than a hunting shotgun you need to take a mandatory gun safety course, psych eval, and a few hours on a range, make this last 5 years before needing renewal, and reselling to someone without said licence is a criminal offense. And have this be at the purchasers expense.
That way the responsible gun owners can buy their guns, enjoy them, but it would help to alleviate the more tweaked individuals from getting their hands on them.
Beyond that the healthcare system needs a good reform so said tweaked individuals get the help they need before they snap, because no matter how hard guns are to get, those tweaked fellows WILL find a way to kill others if they want, hell you can make dome very potent pipebombs from home-depot and google.
A good thing to remember, is that a gun, like a hammer, knife, or bomb is an object, it has no will or actions of its own the thing that gives these things purpose and makes them a weapon or not is the mind which wields them. And it is important to make sure that the mind behind the tools is steady