The Radian GUARDIAN Optic Mounting System provides unprecedented protection for your pistol red dot optic. Machined from 7075 aluminum & hard anodized, the design provides top/ front/side impact protection. Optional back-up sights, provide an unobstructed, irons forward sight picture. Radian Weapons STUD-LOK threaded stud/nut mounting interface is the most secure system on the market. This provides much longer thread engagement, greater hold down power, with increased shear resistance. TRU-SEAL eliminates the need for an added sealing plate. Pre-installed O-rings on the mounting screws hold the plate watertight to the slide, sealing out moisture, eliminating corrosion in the mounting threads. Product Features Provides top/front/side impact protection of red dot Mounts with stud-lok and tru seal o rings on mounting screw sealing out moisture Stealth back-up iron sights Product Specifications Manufacturer: Radian Weapons Color: Black Finish: Hard Anodized Fabric/Material: Aluminum Gun Make: Glock Gun Model: Glock 45 MOS, Glock 43X MOS, Glock 34 MOS, Glock 47 MOS, Glock 48 MOS, Glock 40 MOS, Glock 41 MOS, Glock 19 MOS, Glock 35 MOS, Glock 17 MOS Gun Type: Handgun Attachment/Mount Type: RMR Additional Features: Impact Protection Fit: Standard