I recently bought my second Maverick 88 18.5 inch barrel defense shotgun. My eyes far away are as sharp as an eagles but up close i need glasses or something bright to aim. I put a Hi Viz snap on tactical sight on my gun, i like the tactical model as it has metal inside the plastic. When i fired with J.M. 7/8 ounce slugs offhand the gun at 50 yards, the slug went about 6 inches high, groups were within an inch or so, so it groups good. I then tested with AA heavy target 7.5 shot, the AA kicked harder than the slugs. The AA shot went about 2-3 inches above center, both the slugs and shot, shot center just high. Could it be the Hi Viz sight?, if I take it off though, the bead will be lower set than the fiber optic and won't it shoot even higher? Also I can barely see the little bead. Thanks for any help.