A well balanced breakfast, being necessary to a healthy diet, the right of the people to grow and eat food, shall not be infringed.
Who has the right to grow and eat food?
A) The people (with no other condition)
B) The people (after a waiting period and background check)
C) A well balanced breakfast
D) A healthy diet
E) The police
"A well-educated electorate, being necessary for the endurance of a free state, the right of the people to keep and read books shall not be infringed."
Clearly you couldn't expect the right to keep and read books to only apply to the well-educated electorate.
https://www.law.cornell.edu/uscode/text/10/246
In fact the first weapon ban to hit SCOTUS, US v Miller, hinged on the fact that sawed off shotguns had no military application, which was legal basis allowing them to be banned. The court at the time considered bans of military weapons unconstitutional.
The national guard is controlled by the government, it's not a militia. The last 20+ years or so it's pretty much regular army.
Along a similar line, do you think a free press would be free if the government was the one who decided who was press and who wasn't?