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George, that particular set is for Glocks only but they sell ones that will work on the P320- not sure what caliber you have but for 9mm or 357 Sig there are either of these: https://www.budsgunshop.com/catalog/product_info.php/products_id/711010790/bright+%26+tough%C3%A2%E2%80%9E%C2%A2+night+sight+set%3b+%238+front%2fnovak+rear+-+for+sig+sauer+9mm%2c+357sig+%28excluding+p938%29 or https://www.budsgunshop.com/catalog/product_info.php/products_id/31904/bright+%26+tough%C3%A2%E2%80%9E%C2%A2+night+sight+set%3b+%238+front%2f%238+rear+-+for+sig+sauer+9mm%2c+357sig+%28excluding+p938%29 and for .40 S&W or 45 ACP there is this: https://www.budsgunshop.com/catalog/product_info.php/products_id/31925/trijicon+bright+%26+tough%C3%A2%E2%80%9E%C2%A2+night+sight+set%3b+%236+front%2f%238+rear+-+for+sig+sauer+40s%26w%2c+45acp+%28including+p938%29