Monstrum Dovetail Red Dot Mounting Plate for Glock Pistols for Non-MOS Version Glocks. The plate installs seamlessly in place of your fixed rear sight. Requires removal of your fixed rear sight using a sight pusher tool. Allows for use of an electronic red dot sight for improved visibility and faster target acquisition. The mount is compatible with Glock models 17 19 20 21 22 23 34 35 40 41 43x 45 47 48 Not for MOS version Glocks. MOS version Glocks require a dedicated MOS red dot adapter plate. Not compatible with other pistol models. Your red dot attaches directly to the top of the mounting plate. Compatible with Docter/Noblex footprint standard red dots including Vortex Venom/Viper and Burris Fastfire 2/3. Not compatible with other model red dots. Please refer to the compatibility chart graphic before purchasing. 2mm in width for ultra low profile mounting Made from hard anodized 6061 grade aluminum. Recommended torque specs : 15 in/lbs. All Monstrum products come with a lifetime guarantee Specifications for Monstrum Dovetail Red Dot Mounting Plate for Glock Pistols: Manufacturer: Monstrum Red Dot Sights-Footprint: RMSc Optic Cut: RMSc Cut Gun Rail: Dovetail Fabric/Material: 6061 Aluminum Color: Black Gun Model: Glock 34 Glock 47 Glock 19 Glock 40 Glock 41 Glock 20 Glock 45 Glock 35 Glock 23 Glock 22 Glock 17 Glock 21 Package Contents: Monstrum Dovetail Red Dot Mounting Plate for Glock Pistols Monstrum ZD10V-2: Dovetail Red Dot Mounting Plate for Glock Pistols for Non-MOS Version Glocks