That is what I have on my M-4gery.
Yankee Hill rail mounted folding iron sights:
http://www.yankeehillmachine.com/store/sights.html
co-witness nicely.
I have a MAGPUL BUIS behind my EOTEch, also cowitnessed on the front post. So I’m still used to the irons, in that my eye position with the red dot still puts the target on top of the front post sight. Kind of keeps the irons in the game, if your EOTech goes down and you have to flip up the BUIS. Everything is in the same position.