Rock Island 3209 ACT-MAG 17rd 9mm Luger Fits Sig P320/M17 Blued Metal
http://www.tandktactical.com/shop/812285025476-rock-island-3209-act-mag-17rd-9mm-luger-fits-sig-p320-m17-blued-metal-19169
http://www.tandktactical.com/web/image/product.template/19169/image_1920?unique=4a64792
This ACT replacement or spare magazine is compatible with your Sig Sauer P320, M17.
