To install the red dot sight using this plate, the rear sight of your firearm must be removed. This plate is compatible exclusively with the Vortex Venom model. The EGW Sig Sauer P320 adapter plate facilitates the installation of a Vortex Venom red-dot sight on a P320 by replacing the rear sight Apply blue loctite and torque the provided mounting screws to 15 in-lb, it is advisable for a qualified gunsmith to conduct the installation The adapter plate is incompatible with the Sig Sauer M178 and models designed for the Romeo1 Pro