my mossberg 535 i was gifted (brand new) 2 christmases ago does not want to shoot worth a damn, we have bought 2 different sights, used lightfield slugs (among others), and i cant get a group in the money. My grandpa was a 51st infantry marksman and can hit a 5ftx3ft target at 600 yards with a peep sight on an m1 23/24 times...and not even he can get 3 in the 10x at 40 yards! The sights are perfect left and right, but they shoot 5 inches low, and there is no more room to move any sight any further up, were going to call mossberg to get an explanation pretty soon

-But does anyone have any knowledge on this or can someone help me, maybe a diagnosis on my problem?