Where do you place the rear sight on the rib? I have been told that it should be placed as far back as possible??
i try to put it on the same plane as the front sight. The rib has a curve in i, so I try to match them when possible. I'll also move the location of the sight to adjust POA/POI.
15 inches from back of rib, works very well!
I place the front and rear sights as far apart as I can.
A lot depends on your eyesight. I have great distance vision but need reading glasses (I am 59). If I have the rear sight too close it is really fuzzy and distorts the front sight. I moved my rear sight forward a bit for a better and clearer sight picture. It did not change my POI.