FN 201003461 509 17rd 9mm Luger Black/Flat Dark Earth Stainless Steel
https://www.tandktactical.com/shop/845737010089-fn-201003461-509-17rd-9mm-luger-black-flat-dark-earth-stainless-steel-17468
https://www.tandktactical.com/web/image/product.template/17468/image_1920?unique=8d827a9
This magazine is compatible with your FN 509. *Note- Will not work with FNS TM or FNX TM series pistols.
