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sorry they are not interchangeable and will not work here is the 15 round for the SD9 https://www.budsgunshop.com/product_info.php/products_id/72009/smith+%26+wesson+19925+sd9+9mm+16+rd+stainless+finish

Hi Derek and welcome. No Sir. There is a floorplate extension for 15rd SD9 magazine for 3 extra rounds (18) here : https://gallowayprecision.com/plus-3-mag-extension-for-sigma-and-sd-9mm-pistols --- Cheers and stay safe!

Hi derek, no sir, you can not use this magazine in the SD9. You want this one https://www.budsgunshop.com/product_info.php/products_id/72009/smith+%26+wesson+19925+sd9+9mm+16+rd+stainless+finish , Stay safe & have a great day!