Trijicon HDs for the M&P can be made to fit the Shield if you don't mind a little bit sticking off the side of the rear sight dovetail.
Ameriglo makes the similar I-Dot sights (less the fluorescent insert) for the Shield.
XS makes the Big Dot and Standard Dot for the Shield.
Apex Tactical has drop-in trigger kits for the Shield, but the Shield trigger is better than the stock M&P trigger.
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