The Canik Mete MC9 uses a modified RMSc footprint which means any Holosun K Series Optic will fit directly on the slide.

Hi Steve, the MC9 uses the RMSc footprint, so you have plenty of options. The Holosun HS507K X2 micro red dot sight stands out as the most favored RMSc red dot sight for subcompact firearms.
>>> amazon.com/HOLOSUN-HS507K-X2-Classic-Multi-Reticle/dp/B08G6SSTGX?crid=2K5CPN7NB7LD7&keywords=B08G6SSTGX&qid=1695685804&sprefix=b08g6sstgx%2Caps%2C108&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&smid=A1RUOWZ2794IXS&th=1&linkCode=ll1&tag=badassoptic-20&linkId=044ed4e418694def74074c9f5d558d95&language=en_US&ref_=as_li_ss_tl
budsgunshop.com/product_info.php/products_id/137909/holosun+he507k-gr-x2+reflex+sight+multi+reticle ,
Stay safe & have a great day!

Hi Steve and welcome. RMSc. The Green Dot Holosun 507k X2 is a perfect direct fit : amazon.com/HOLOSUN-HE507K-GR-HS507K-Multi-Reticle-Circle/dp/B09322ZGK7?th=1