Need help on sightning M3 Super 90 with slugs

[glockstan]

I was shooting with slugs and most of my shot was down and to the right about 3" from center target, should I move the front or rear sight to left or right and rear sight forward or backward to move the shot up or down, thank you very much for all your help.

[tucker301]

http://en.wikipedia.org/wiki/Iron_sights#How_to_change_point_of_impact

[glockstan]

Thank you very much