As you are sure that the follower could not be correct nor original to that rifl,e I would change it. The stock is another story. Dave McClain had answered a very similar question as follows : " It's a stretch that a stock with a MWO ( modification work order ) that was not issued until Nov. 1941 could be on a rifle with a 8-41 barrel but a three month final assembly difference is certainly possible. Rifles were often delayed at final assembly for a variety of reasons so it's still possible your rifle was not final assembled until after Nov. 1941. "