When the time comes to mount your new Trijicon RMRcc Concealed Carry Red Dot Sight you need to have the correct plate to get the job done. Each of these plates is carefully machined to ensure a perfect marriage between your pistol and optic. Don't trust your optic to second rate mounting plates use Trijicon factory mounting plates. The manufacturer recommends professional installation, but a competent individual who is mechanically inclined can perform and complete the installation successfully. Features : For SIG Sauer p365XL RMRcc Mounting Plate Adapter Plate Made from Steel Mounts to Precut Slide