Rear BUIS

Depend what you want from it. I have a Troy and Magpul.

Troy is very sturdy and about the flattest laying folding rear BUIS. It has windage adjustment but no elevation (adjust the front sight). It is rugged and simple to operate and locks solid.

The Magpul is not as flat but still fits underneath my Weaver 1-3x scope eyepiece. Although made of plastic, so are their mags which are very durable. It is a lot cheaper than the Troy and similar high end BUIS.

I got the Troy on my first AR15 since it was top rated and proven. After that I was willing to try something different. If it was to be my first or only BUIS I would go with Troy again.
 
Troy if you're planning on running zoom-sights. They fold up nice n' neat underneath my ACOG. Otherwise, with a 1x RDS, fixed irons with 1/3rd lower co-witness may work--out of the way when you're shooting through the RDS, but immediately accessible if your RDS goes down.
 
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