The change for the 10-2 was going to a left-hand thread for the extractor rod. It was produced for only a year or two before another change was made. For most (other than possibly a serious M&P collector), the 10-2 version wouldn't command a price premium vs. any other M&P of the same general period in similar condition. But $375 is not a bad price for any higher-condition M&P.
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