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Hi Adam and welcome. Everyone has their favorite. This guide will help you decide what is best for you Sir: https://freedomgorilla.com/collections/direct-fit-sig-p320-m17-m18-optics?srsltid=AfmBOor0vMXTKvUXtChXYTeZX6BzuMo4QsVrF--5Xe2t07P_F-egbSMn

Hi Adam, here are two excellent choices that would be a direct mount to the P320 https://www.budsgunshop.com/product_info.php/products_id/95942/leupold+119688+deltapoint+pro+1x+obj+unlimited+eye+relief+2.5+moa+black , . https://www.budsgunshop.com/product_info.php/products_id/113462/sig+sauer+electro-optics+sor1p100+romeo1pro+1x+30mm+obj+3+moa+red+dot+black+cr1632+lithium , . Stay safe & have a great day! .