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Hi George, yes sir, this will take 15rd magazines, available here budsgunshop.com/product_info.php/products_id/29478/promag+fnh+fnx45+45acp+15rd+blued , Stay safe & have a great day!

yes it will work just fine with the 15 round magazines the 10 round mags are just modified 15 round mas so they can sell the guns in states that limit mag size FN factory mags are available here I have not had good luck with promag magazines https://themagshack.com/shop/pistol-magazines/45-acp/fn-fnx-45-45-acp-15-round-magazine/

Hi George and welcome. 10rd and 15rd magazines are the same physical size with the 10rd mags having an internal blocker to restrict rounds for sale in capacity restricted States. The pistol can accept and shoot both. Cheers and Happy New Years! 15rd mags available here : https://www.budsgunshop.com/product_info.php/products_id/29478/promag+fnh+fnx45+45acp+15rd+blued