Pitch is commonly referred to as the angle of the buttstock when it is against your shoulder.
As I understand it -- if you ran a line along the barrel to the rear of the gun and, at the same time ran a line from the face of the buttstock up to the line from the barrel you would define the pitch. If the lines were perpendicular at the intersection, the pitch would be zero, if the lines were not perpendicular at the intersection the difference in the angle at intersection would be the pitch.
It is important because if angle is improper the muzzle of the gun can be pointed up or down while you are thinking how good the stock fits you.
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