The definition of Second amendment change from time to time.
Supreme Court in the early 1/2 of last century once said owning a gun is a privilege, not a right (Gov regulation is possible), and the arms were meant for State Militia, and specific define "militia" to be the national guard.
In effect, you CAN have a gun, but it is with Government consent. They can literally decide when, where and what model of gun you can keep.
It was only in 1970s and later suddenly people start making up stories about defense against tyranny etc and the supreme court changed their mind to "Right to bear arms" means guns for everyone!
In other news, I actually do believe gun owning Americans can stop homegrown- dictators--Look how well of a job the Iraqis did on the Americans
.