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I found the 1-4 and 1-6 variables, even with a 30mm tube just weren't as good for light gathering in low light with that smaller 24mm objective as a 2-7x33 or 3-9x40 1" tube.
So on my hunting AR, a...

That's a 1x power red dot, not an ACOG x3-x4 scope.
Depends on your usage.
Hunting? 2-7 or 3-9
Service rifle x3 or x4 fixed
3 gun 1-4 or 1-6
Zombie Armageddon fantasy or plinking, then a red dot...