Believe the issue spans the decades.
I did the finishing reamer treatment on what I called my '.21 caliber M63' and it is now absolutely perfect.
Though not as noticeable, I have a K22 (c.1952) and a M18 (c.1967) that will eventually also see the finish reamer. It just makes outings with shooting them so much less trouble.
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Ret'd LEO
SWCA #2275
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