Yes, all M&P internals are the same, same sear, striker block so the triger job for FS will work on Shields. Polishing is easy and will make an improvement. If you have any reservations, research APEX Tactical and you can buy the Kit of modified parts and just install them. I did and I'm happy w/ the improvement on both my FS9 and Shield 9.
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9/40FS, 9c, 9 Shield, MP22
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