It does mention "a well-regulated militia" though, and oddly legal gun owners don't belong to one of those.
The ability to form militias is so important, that everyone should have the right to bear arms, in order to enable this.
The idea is that it prevents the idea of a "special militia" having some selection criteria, so the government of the day cant make qualifying for its group a requirement to own guns.
You might say that a farmer runs a "well-regulated farm" because things run smoothly. Or that the windmill was a "well-regulated machine."
It would also mean having regular meetups in your community to discuss any coordination necessary in times of emergency... Where to show up with your gun(s), who is in charge, who to communicate with, etc.
I'd be a proponent of returning to this norm.