Radian Weapons Guardian Features The Radian Weapons Guardian is engineered around the proprietary TRU-SEAL system which uses O-rings on the mounting screws to create a watertight seal between the optic mount and the Glock MOS slide eliminating the need for a separate sealing plate and preventing moisture and corrosion from compromising the mounting threads over time. The STUD-LOK threaded stud and nut interface provides significantly longer thread engagement than standard optic mounting screws delivering greater hold-down power and increased shear resistance for a mounting system Radian positions as the strongest on the market. Together TRU-SEAL and STUD-LOK address the two most common failure points of pistol-mounted optic systems in a single integrated mount solution. The Glock MOS optic mount is compatible with Holosun 407C and 507C optics for direct adapter-free mounting on Glock MOS slides without modification. The black finish provides a low-profile tactical aesthetic that blends with standard Glock MOS slide finishes for a clean factory-correct appearance with the optic installed. It is the definitive mounting solution for Glock MOS owners who run Holosun 407C or 507C optics and demand waterproof corrosion-resistant zero retention under hard carry and duty use. Radian Weapons Guardian Specifications Manufacturer: Radian Weapons Model: Guardian Color: Black Mounting System: TRU-SEAL/STUD-LOK Compatible Pistols: Glock MOS Compatible Optics: Holosun 407C/507C