According to Roy Jinks the turn line is an indication the revolver is working properly. The cylinder stop is designed to ride on the cylinder and the line is not an indication of a poorly timed revolver. I am sure a gun could be tuned to drop the bolt at the last possible second but would probably lead to lockup problems if fired in rapid double action. As Roy has often mentioned S&W was in the business of selling guns not pleasing collectors, reliability was their goal not pleasing fussy collectors.

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John. SWCA #1586