HK 239257S SP5K Black Detachable 10rd 9mm Luger
https://www.tandktactical.com/shop/642230255210-hk-239257s-sp5k-black-detachable-10rd-9mm-luger-2580
https://www.tandktactical.com/web/image/product.template/2580/image_1920?unique=b91f218
This replacement or spare magazine is compatible with your HK SP5K.
