If you mount a Eotech say 512 to a AR with a yankee hill flip up iron/gas block and a magpul rear buis will it co-witness or will I have to buy a mount that will raise the Eotech up? Also I do plan to run a flip to side magnifier as well.
Assuming your sights are the same height as my Troy flip ups, you will get co-witness in the center of the 512. My Larue quick disconnect mount will bring it up to 1/3
This.
Agreed. Absolute without a riser of some sort.