Seems to be some inconsistency in the measurements you've posted of the rear gage. If this most recent measurement you performed with empty casings in place is correct, I would expect you to be able to feel quite a bit of fore and aft movement in the cylinder when it's closed.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 02-04-2017 at 10:29 AM.
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