Radian Weapons Guardian Optic Guard Red Dot Sight Mount Black. TRU-SEAL eliminates the need for an added sealing plate. 0-rings on the mounting screws hold the plate watertight to the slide sealing out moisture eliminating corrosion in the mounting threads. Our 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. SIX back-up sights (BUS) seamlessly integrate into the Guardian Optic Mounting System providing rapid reliable and precise target acquisition in scenarios of red dot optic malfunction. Featuring anti-glare anti-snag and ultra low co-witness design SIX sights lie inconspicuously in wait until you need to deploy them. Like a wingman when things aren't going as planned SIX has your six. Specifications for Radian Weapons GUARDIAN+SIX MOS/407-507 Red Dot Sight Mounts: Manufacturer: Radian Weapons Color: Black Gun Make: Glock Gun Type: Handgun Fabric/Material: 7075 Aluminum Red Dot Sights-Footprint: RMR Optic Cut: Glock MOS Country of Origin: USA Package Contents: Radian Weapons GUARDIAN+SIX MOS/407-507 Red Dot Sight Mounts T25 Torque Bit Radian Weapons H0001: Guardian Optic Guard Red Dot Sight Mount Black