I have Troy Folding Battlesights on my Spikes M4LE carbine and they cowitness perfectly with my Aimpoint PRO red dot on the Aimpoint QRP2 mount.
The Troys are not cheap, but I would recommend them over any other folding BUIS. They are rugged, easy to use, and have an excellent sight picture (much better, for example than the popular polymer MBUS sights from Magpul).
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