Barrel cylinder gap, or the expressed distance between the cylinder face and the barrel extension, is correctly measured with the cylinder at rest, and fully forward.
If you measure with the cylinder held back, you then have the B/C gap plus the available cylinder end shake.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 10-05-2020 at 04:36 PM.
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