most of the original 13 had state constitutions that contained both a RKBA, in many cases more clear and explicitly defined than the 2A, but also defined the state militias. Again typically, the language used included every able bodied man aged 14-60, or some similar range, and further required that every man keep a musket in good working order, and some quantity of both shot and powder. Rather prescriptive. Several states allowed a man to provide a proxy, maybe a slave, to participate in their stead. But no able bodied man, except in some states under an allowance for conscientious objectors, could typically just opt out without being able to provide a replacement.
"Well regulated militia" should be perfectly clear. Imagine an army that didn't drill, couldn't march together, fire their weapons and fight in the manner of the day, or obey orders from a clear chain of command. They had to train together. Well-regulated. Like a clock. Clear on that?
Now, how could the citizen militia muster if they didn't have weapons? So they obviously had to either own them, or have them provided to them. An enormous body of writing exists as to the original meaning of the 2A, all of which points to the inherent right of a free people to own their own weapons for all lawful purposes. The only lawful purpose that no longer exists in practical terms is service in the militia - because sporting purposes, hunting and self-defense purposes are still alive and well.
One of the primary reasons underlying the 2A was the colonials utter outrage at King George III systematically attempting to disarm them as the dissent with England was percolating. Thomas Jefferson was particularly vocal on the subject. Look it up. By the way, he also frequently suggested that periodic revolution would be good for the country.
“Occasionally the tree of Liberty must be watered with the blood of Patriots and Tyrants.”
“A government afraid of its citizens is a Democracy. Citizens afraid of government is tyranny!”
“A little rebellion is a good thing. ”
"To my mind it is wholly irresponsible to go into the world incapable of preventing violence, injury, crime, and death. How feeble is the mindset to accept defenselessness... How pathetic." - - Ted Nugent
"Cogito, Ergo Armitum Sum" - (I Think, Therefore I Am Armed)- - anon.