Whilst out shooting today I was approached by the landowners father,asking about the shooting,and he mentioned that at the age of 80 he was giving up shooting and he had a shotgun for sale at £40,needless to say I said that I could be interested,turns out that the gun is a Laurona Eibar 12b o/u, n/e, fixed choke in very good condition except for a small "dink" in the top barrel,which does intrude inside.I tried the gun out in the fields and it shoots well,tight in the joint. I'd like to know if the damage can be repaired,so any ideas please.