I am fixing an old Marlin Model 80 for my grandfather that is not ejecting shells. After being shot this thing hold the spent case still in the bolt not "kicking" it out. And no it is not the ammunition. What do you think needs to be done? I was thinking just get a new style one piece extractor for it, two new plungers, and two new springs so that way I don't have to mess with anything else just Change it all and take the guess work out. But my question is could it be anything else?