If you gun is a field grade gun with a low comb stock this can cause low shots. A bird gun(pheasant/duck) is made to be pointed and not aimed like a rifle. If you place your cheek on the stock your eye will be lower than the back of the barrel causing you to dip the barrel to get on target. There are kits for raising the comb on a shotgun,but you can experiment with padding taped to the stock to see if it works for you. If you put a scope on it then you won't need this but it will make it more comfortable to aim.