This mount replaces the adjustable rear sight on the GP 100 and allows the installation of either the RMR, SRO, Or Holosun C-series Micro dots.
The rear sight on the GP100 is the same but the rear sight cut on some GP100's will require machining the rear of the scope mount to allow alignment with the hole in the gun. This is a critical contact point, and a Gunsmith is recommended.
