I just recently purchase one of the small red dot sights for my AR-15. It is from Primary Arms and looks like a copy of the Aimpoint Micro. I was impressed ! The little sight mounted well and the sighting in was on the money. It is very fast to line up. I hope that it holds up well. Can not say for long term durability. Anyone have one that would care to comment. I like how it comes on target better than my EO Tech's. Just as fast !