I just recently acquired a nice older Remington 121 pump .22. Occasionally about every 5th or 6th shot it fails to extract the empty. When it does, I close the bolt, activate the release and it extracts the empty on the next try....odd. Works that way every time it fails upon firing. One poster on RimFireCentral suggested using a "bore iron" to smooth out the bore. I researched it and it does sound like a good idea. The external bore area generally looks a bit rough. What I saw on line demonstrates the use of the "iron" on older rolling block rifles where the bore is easily accessible. What would one do for the closed chamber of the 121? I'm not much of a gunsmith so might be better off just paying someone else to smooth it out. Your thoughts?