If he was doing something unlawful the ranger could have either arrested him or sent for police. It is a crime to be intoxicated in possession of a firearm so your whole story has a few large holes in it.
If he wasn’t doing anything illegal it’s none of your business what he was doing or how he was armed but you are as free to leave as he was to remain.
Again- not drunk enough for the ranger to confiscate, let alone arrest. But stupid enough for a long conversation that apparently went nowhere cuz he kept on open carrying his AR.
So you actually have no idea what interactions the Ranger had with him or what said Ranger thought about how intoxicated he might be or whether or not he’d actually done anything threatening or unlawful.
The legal limit is the same for driving as it is for handling firearms so obviously he wasn’t drunk at least in the eyes of the Ranger who is actually trained to make such determinations.
Nope. The Ranger specifically told my wife and the rest of the campers there was nothing he could do about it. And you are right there is nothing unlawful about what he did. But that doesn’t make it sketchy as hell. And I hope you would agree with that.