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While it’s a good practice, it isn’t necessary. The Garand Collector Association did a test on a M1 to determine how much muzzle wear a standard GI steel cleaning rod would produce (the results were published in their Spring 09 journal). During the test it took them 66,000 strokes in order to degrade the barrel enough to change the ME reading one mark on the gauge. During this test they were trying to inflict wear on the barrel and were being as abusive as they could. So I would guess if you were careful it would take you 100,000 strokes to produce enough wear to change your ME by one increment.