Kevin, not sure what the other guy that commented was talking about. The Canik MC9 is compatible with various micro red dot sights, particularly those that use the standard RMSc footprint, such as the Shield RMSc, Holosun 507K, Sig Sauer Romeo Zero, and Canik’s own MECANIK MO1. The Ruger Ready Red Dot also uses the RMSc footprint. So no adapter necessary it'll attach directly to the slide. Hope this helps.

Josh, isn't that what I said? - Kevin, no plate needed. The optical footprint on the METE MC9 is RMS-C, same as the Ruger Ready Red Dot. It will fit right out of the box.
Stay safe & have a great day!