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All,
A friend's 686-6 has a measured flash gap between the cylinder face and the forcing cone of 0.014" as measured with feeler gauges. There is no perceptible endshake.

Should this revolver be fired or examined by a gunsmith first. The cylinder has been cut for moon clips...
 

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Standard barrel cylinder gap is .004 - .008 so that one is excessive (lower end preferred). If the moon clip work was done aftermarket S&W won't fix it under warranty (& maybe not @ all). It definitely needs the barrel set back or a new barrel.
 

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It's about double the ideal cylinder gap, and just above what many consider to be safe.

S&W specs the ideal gap at .008 inches. .010 is considered max.
 
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