My older 10/22 developed a FTE prob about 6 mons. ago.  Changed out the extractor, plunger, and the spring with no help.  I did inspect the ejector, and the slot it rides in, they look good, doesn't look worn.  I swapped out the entire bolt assemby with a spare from a friend, and that seems to have solved it.  Seems strange that the bolt would go bad.  I haven't measured anything yet.  Has this happened to anyone?