I know this is prolly gunna sound dumb, but I've always felt that having the sighting system moved further back was for being more accurate at distance because having it closer to your eye allways you to more chose angle, height, etc. I've also always felt that having the sighting system more to the front was about having a quicker target acquistion and being able to place on target at closer distances. I've got mine located like right at the point in he rail were it's that thick block were it's pieced together