Our Founding Fathers didn’t have in mind weapons that could mow down innocent citizens in a matter of seconds when they wrote the Second Amendment. Such high-powered weapons did not exist in the Revolutionary War era of militias.

Having just over-thrown the existing government (remember King George?), I suspect they envisioned whatever weapons those they might have to face would have. If the other guys, be it criminals or oppressors, had innocent-citizen-mow-down-in-seconds weapons, then the general populace should also have them.