I installed the taller front sight post (Colt part #SP64665), while it has made things better, it still is not enough. I am still hitting too high. I need 3-4 more clicks counter-clockwise to get to zero at 25yds., but I can already see daylight between the bottom of the front sight post and the front sight base. I am now at a total loss. Any ideas? The rifle shoots great (if my eyes weren't bad, it would be a one-hole gun). Would a riser under the MI BUIS help? Thanks to all.