Nikons are very nice...but on my AR is a Burris XTR with illuminated reticle. Whatever he gets, make sure you can light it for dark hours shooting. If he doesn't need magnification then just go with a red dot
Leupold Mark AR, probably right at the top of your budget. I have one and just put it on my AR in July. Still havent really looked through it much, so I cant give a good review.
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