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A lot of gunsmiths don't want to crank that barrel down against a GO gauge because they are afraid of damaging the gauge. One way to avoid a problem when it is necessary to remove and reinstall a barrel is to stamp witness marks on the bottom of the barrel and receiver before removing the barrel, then lining them up on re-installation. It is a lot more accurate than eyeballing the sights or even using a headspace gauge.
Jim
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