I agree with Psych tests as one measure to reduce the number of nutters who are able to hold a gun license & procure a weapon.
It should be part of many measures / restrictions.
I also believe the U.S. is beyond the point of implementing measures.
Unfortunately even the ACT has tripled over the last several years in gun ownership (6,000 to 18,000).
Although a lot of the gun owners have multiple weapons.
Were not a farming community controlling vermin. Most of these owners go to the range when they first get their license and weapon.
I am not sure of the law in regards to regularity at ranges etc... to retain your license/rifle/hand gun.
I'm of the belief if you have one then it will be your first thought to defend/attack and not your last.