After you remove the extractor, then insert the go gauge. The action should close on it.
Open the action, insert the cleaning rod and push it the go gauge.
Insert the no-go gauge and try to close the action. If it doesn't close, that's good. If it closes, the chamber is out of SAAMI spec. Open the action, insert the cleaning rod and push out the no-go gauge. Discuss the remedy with your gunsmith.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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