I don't see a "notch" or anything out of the ordinary in the photo.....other than the nasty scratch on the cylinder. Try another photograph and add some light with a flashlight or other source. A better description of exactly where the mark is would also help.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 06-10-2016 at 10:28 PM.
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