I'm thinking of buying a new (used) gun. The target and all papers are still in the box and the gun is virtually like new. The target indicates the shot date as sometime in 1983 (can't remember exact date). My question is the shot taken is very low and left of the point of aim. The gun has fixed front and back sights. Should i be concered that the gun will not shoot anywhere near point of aim or is it more likely the factory shooter was nursing a hangover?