The detent spring on my M&P with the thumb safety appeared to be pretty good, so I borrowed a page from Sandog's book and roughed up the safety where the detent contacts it and it is much improved. I may touch it up just a little bit more when I next workbench it to install the Apex flat faced trigger kit, but I'm OK with the safety now. I'm glad that I opted to do the fix myself rather than send it back to S&W.
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