Crossfiring
I suffer from this malady myself. I use a Magic Dot cut down to about 9mm and placed on the non sighting lens to eliminate the front 1/3 of the barrel. This system works very well, assuming you have a consistant mount and face pressure. Another product used to eliminate crossfiring is called the "Vari-Bright Sight II Cross Fire Eliminator". This device replaces the front sight on your shotgun barrel. It hold the dominant eye on the target and prevents the non dominant eye from taking over and seeing the sight. I use this system along with the Magic dot. It helps immensely.
