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Hi James and welcome. The M&P9 Shield Plus has an RMSc (also known as RMS/SMS) optics footprint. This means that any red dot sight designed for the RMSc standard will fit directly onto the Shield Plus without needing an adapter plate. Cheers, stay safe and enjoy!

Hi James, the new Shield Plus Carry Comp does not use adapter plates, the optic will mount directly on the slide. The slide is cut with the RMSc footprint. Any RMSc compatible optic will work. Stay safe & have a great day!

RMSc (also called RMS/SMS) optics footprint