Yes sir this will fit your Mete MC9.

Hi Aaron and welcome. Yes Sir, the TP9 Drum will fit and function in the Mete MC9 Pistol. Best price for your choice of color for the extended magazine filler sleeve to fill the bottom magwell gap is here: blackcatworks.com/Canik-MC9-Magazine-Sleeves_p_1034.html --------- Cheers, stay safe and enjoy!

Hi Aaron, the MC9 is capable of accepting all canik brand magazines, as long as the magazine body is as long if not longer than the grip of the firearm.
You may want to add this sleeve >>> hurleywelding.com/product-page/magazine-sleeve-for-canik-mc9-with-18-round-tp9
Shooting without sleeves on your longer mags isn't fun. This sleeve fills the space in your hand when using a factory standard MEC-GAR/CANIK 18 round magazine in your MC9
Stay safe & have a great day!