Radian Weapons Guardian Holosun 507C Optic Guard Mount For MOS Glock Anodized Finish 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. Specifications for Radian Weapons Guardian Red Dot Sight Mount: Manufacturer: Radian Weapons Color: Black Finish: Anodized Gun Make: Glock Gun Type: Pistol Fabric/Material: 7075 Aluminum Attachment Type: Picatinny Package Contents: Radian Weapons Guardian Red Dot Sight Mount 1 - GUARDIAN Optic Mount and Guard Plate 2 - Plate Mounting Screws 2 - TRU-SEAL&O-Rings 2 - STUD-LOK&Studs 2 - STUD-LOK&Self-Locking Sleeve Nuts Radian Weapons H0021: Guardian Holosun 507C Optic Guard Mount For MOS Glock Anodized Finish Black