If the 2nd Amendment only applies to militias as described by the Constitution, then let's look at what that entails, from the framers of the Constitution:
Noah Webster: "Before a standing army can rule the people must be disarmed; as they are in almost every kingdom in Europe. The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed, and constitute a force superior to any band of regular troops that can be, on any pretence, raised in the United States."
George Mason: "to disarm the people; that it was the best and most effectual way to enslave them ... by totally disusing and neglecting the militia." ... "Who are the militia? They consist now of the whole people, except a few public officers."
James Monroe listed the right to keep and bear arms as a "human right"
Do progressives really want to follow this line of reasoning? This means that now people can only possess military grade weaponry and train regularly. I mean, I'm all for it, but do dionysus and plantinumdung want the militia to exist as described in the Constitution, with the weaponry and competence assured to it?