And how far out do you want to shoot the AR? I've got a Leupold 1.5-5 that I really like on one AR. Have a generic 3-9x40 on the other that also works well for more distance.
I have the 1x8 but if I had it to do over again would get a 1x4. Nowhere to shoot that I need that type of magnification. Unless you are going prairie dog hunting where you have to be a far distance in order to pick them off without spooking them or willing to travel to a place like Bass N Bucks.. Many or maybe most long distance ranges require a training class or screening to make sure you are sighted in and skilled enough to use their longer ranges.