This brand new designed optic mounting plate is to REPLACE the rear sight of pistol. Specially made to fit Sig Sauer Standard P320 Handgun. Only fits standard P320. It does NOT fit special edition like XCarry, X-5, XCompact and M17 Fit Ade RD3-006A(Huracan), RD3-006B(Python), RD3-009(Crusader), RD3-012(Delta), RD3-013(Bertrillium), RD3-015(Zantitium)Red dots. Also Fit Vortex Venom/Razor/Viper, Burris Fastfire, Meopta, Eotech MRDS, Docter, Insight, Sightmark Minishot and similar red dots. Machined from aircraft grade aluminum with hard anodizing finish. Comes with screws and hardware for installation.