SNs on the inside of the extractor star were definitely done by hand. I have seen some quite sloppy examples which make it appear that the numerals were stamped freehand without using a jig. Similarly, SNs on the inside flats of grips usually seem very random with no effort to make the numbers regularly spaced and aligned with each other. I have one M&P with a grip in which the last digit is double stamped.
Last edited by DWalt; 04-15-2018 at 09:55 PM.
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