A Possible Solution

There may be a possible solution to gun control that I have created, but it is only hypothetical. My desired outcome is to let mentally stable citizens to carry firearms. The solution is to add a federal law which each state can adjust to their liking, but only to add onto it; not away from it. This federal law states that to receive your license to carry, you must be evaluated on your history with violence and have a total of 10 citizens (that have no negative weapon history or records) to vouch that you are stable to control firearms.