It is defined by this claise, “A well regulated militia, being necessary for the security of a free state...”
A militia must be equipped with arms of military utility.
“Well regulated”, in the common parlance of the time the term was written into the Second Amendment, means “well trained.”
You can’t train a militia with sporting arms.
“Well regulated”, in the common parlance of the time the term was written into the Second Amendment, means “well trained.”