Technically the 2nd gives you the right to own any weapon from sticks & stones to an ICBM! It does not restrict criminals or the insane or non-citizens.
There is a lawful way to change it! It requires a Constitutional Convention and Ratification by the States.
It is flawed but WHO do you trust to fix it?
I personally think all Democrats are insane and should not be allowed to even manage their own finances!