M12 barrel serial number question
I just picked up a barrel and a heat shield for a M12, its got the flaming ball on the barrel and its a parkerized barrel. Now the help I need is the serial number is 1039xxx and the Winchester serial number list puts it as 47 but on the bottom of the barrel is stamped 43 and from what I read this is common? now I am looking for a donour shotgun and am confused on what serial number to look for to get the same year. And also wondering what is the proper butt plate?