Hi
It might be the rear sight...They came with different height rear"blades" (the thing with the notch...I don't know the right name) If you get a shorter one, you might cure the problem. If you have other sights, check... If not measure yours and maybe I have a shorter one or maybe someone else here has it.
Also If you are shooting a lite load they shoot higher and you need to correct for that problem.
jim