it's not rocket science. The rear site is a blade, it is probably on a ramp like my 870. There is no need to move the front site with these type of sites. If you are shooting left of the bull, you move the rear leaf to the right, this causes you to move the muzzle more to the right to align the front and rear when you take a shot. If you are shooting low move the rear leaf up, this causes you to move your muzzle up to align your sites when you take a shot.
