How much of the crime, violence and murder would decrease if the laws were changed that if you are in illegal possession of a firearm of any kind you get a mandatory 25 years in prison. Second offense life. This law would protect all legal gun owners rights and would either jail most every criminal or would discourage anyone from having an illegal firearm. If the consequence was that great I would bet the problem would get cleaned up real quick.
Shall not be infringed does not cover convicted felons. They didn't let mass murderers run around with muskets back then either.