Hi James there are 5 that fit the P320 budsgunshop.com/catalog/product_info.php/products_id/44704 budsgunshop.com/catalog/product_info.php/products_id/44119 budsgunshop.com/catalog/product_info.php/products_id/44335 budsgunshop.com/catalog/product_info.php/products_id/55107 budsgunshop.com/catalog/product_info.php/products_id/44697

this is a list of which ones Buds has that will fit the P320 : budsgunshop.com/catalog/product_info.php/products_id/44335 or budsgunshop.com/catalog/product_info.php/products_id/44119 or budsgunshop.com/catalog/product_info.php/products_id/44704 or budsgunshop.com/catalog/product_info.php/products_id/55107 or budsgunshop.com/catalog/product_info.php/products_id/44697.

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

Hi James. You did not specify which shoulder rig so this is a list of which ones Buds has that will fit the P320 : budsgunshop.com/catalog/product_info.php/products_id/44335 or budsgunshop.com/catalog/product_info.php/products_id/44119 or budsgunshop.com/catalog/product_info.php/products_id/44704 or budsgunshop.com/catalog/product_info.php/products_id/55107 or budsgunshop.com/catalog/product_info.php/products_id/44697.

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!