The Radian Weapons Holosun 407/507 GUARDIAN Optic Guard for Glock® MOS Pistols features 7075 aluminum construction with a durable anodized finish for long-lasting performance in the harshest tactical and self-defense environments. TRU-SEAL™ technology eliminates the need for an added sealing plate, while the mounting screws include rubber O-rings for a watertight seal that effectively blocks out moisture and eliminates the risk of corrosion on the mounting threads. A proprietary STUD-LOK™ threaded stud mounting interface with self-locking sleeve nuts maximizes thread engagement for superior shock and shear resistance and unparalleled zero retention under consistent recoil. Includes all installation hardware. Compatible with Holosun 407/507 optics.