I inherited a parker vh grade o frame 20ga. shotgun.The barrels are badly pitted.There is a really bad spot about eight inches from the barrel on the right barrel.I think it is to deep and the walls to thin to back-bore them.the barrel is showing waves on the outside over the pit.What can i do about this.Is it going to be safe to shoot.Where can i find a new set of barrels or who could redo this set.Thanks for the help.