i also have the same rifle and have been researching it, i found few things and i am relaying them to you. if you go to the sears parts direct home page, www.searspartsdirect.com and under search by model # type in the model number on your barrell, not mod. 54, the other number, mine was 273.811, after that a whole layout of my rifle came out with every part in it, so i called the number to order parts underneath, and they said they don't Cary the parts anymore, however, they have a copy of the face of the owners manual, and the date listed under my model number was 08-06-87, i don't know if that was when the rifle was made or when the last time the made the owners manual, i hope i was of some help
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