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If using Doyle's method (similar to my recommendations for shooters of semi-rifles to regularly brush their chambers) is not sufficient to make the operation reliable, a proper gunsmith (such as me) will include a chamber polish as part of a proper cleaning of the mechanism.
Semi rifles are more sensitive to incidental corrosion to the chamber walls, and any gunsmith worth his salt will polish all of the Remington pump/semi rifles he disassembles, for instance.
Kirby
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