Hi Edwardo and welcome to the Buds Community. 18/20rd Canik Magazines will lock in and function but you are working with a shorter grip on the Canik Mete MC9. There will be a huge gap using full size Canik Magazines. In my opinion, the 15rd extended MC9 magazine is the best compromise in terms of cancelability and capacity if carrying. If for home defense then you can use the 18/20rd magazines no issue. budsgunshop.com/product_info.php/products_id/155579/mag+mc9+15rd+9mm+black ------------------------------------------------------ budsgunshop.com/product_info.php/products_id/1250/cent+mag+canik+tp9sa+tp9v2+9mm+20rd -- Cheers and stay safe!

Edgardo, according to canik 18 and 20 round magazines from the canik tp9 series will fit but will stick out a little past the grip. If interested here's a link to a 15 round magazine specifically for the mc9......................... budsgunshop.com/product_info.php/products_id/155579/mag+mc9+15rd+9mm+black .......................... And here's a tp9 18 round magazine.................... budsgunshop.com/product_info.php/products_id/712011865/cent+mag+canik+tp9sa+tp9v2+9mm+18rd ......................... And lastly here's a link for a 20 round tp9 magazine......................... budsgunshop.com/product_info.php/products_id/1250/cent+mag+canik+tp9sa+tp9v2+9mm+20rd ...................... So the 18 and 20 round magazine will fit but will stick out past the grip. Unfortunately 15 rounds is the biggest specifically for the mc9. Hope this helps.