This red dot mounting plate is designed for 1911 with Colt Goverment (G.I) Standard Rear Sight. 1911s have quite a few different rear sight dovetail cuts, such as Colt Government(G.I) Standard, Kimber, and Novak rear sight. This plate is for Colt Government(G.I) Standard rear sight ONLY. It does NOT fit any 1911 that has a different rear sight. Fit Ade RD3-006A(Huracan), RD3-006B(Python), RD3-009(Crusader), RD3-012(Delta), RD3-012 PRO, RD3-013(Bertrillium), RD3-015(Zantitium), RD3-015 PRO, and RD3-028Red dots. Also Fit Vortex Venom/Razor/Viper, Burris Fastfire, Meopta, Eotech MRDS, Docter, Insight, Sightmark Minishot and similar red dots This listing is for red dot mounting plate only. Mounting screws are included.