This Presma cover plate fills a Trijicon RMR optic cut on a Glock-pattern slide when no red dot is mounted. It seals the optic pocket and protects the cut from dirt and debris. The plate is machined from 6061 aluminum with a black anodized finish and chamfered edges, and it supports the forward alignment bosses found on RMR-cut slides. Features: Fills a Trijicon RMR optic cut Supports forward alignment bosses 6061 aluminum, black anodized Chamfered edges Torx mounting screws included Fits Glock-pattern slides milled for the Trijicon RMR footprint only. This plate does not fit RMS/RMSc-cut slides. Confirm your slide's optic cut before ordering. GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.