1) Yes, I have seen some barrels on pre-13 guns with the reinforced lug. Now, were these original barrels or a set of replacment barrels? I can't answer that question precisely; although I suspect these were replacement barrels (re-barrelling was a service provided throughout the existence of Hunter Arms). 2) My answer to question No. 2 is no, although the guns might have been used for that purpose at some time; remember shooters had shot trap and live pigeon for decades before Hunter ever advertised their "trap package and besides, I rather doubt that the former owner of your friend's 16-bore would have used those barrels for any kind of serious trap shooting.