The Trijicon Fiber Optic Sight Set for Glock Standard MOS Frames is a rugged, battery-free open iron sight system purposely engineered to optimize target acquisition for tactical, competition, and duty shooters. Utilizing premium passive light-gathering fiber optic chemistry reminiscent of Trijicon's legendary ACOG combat optics, the front post captures and intensifies ambient lighting to produce an ultra-brilliant daylight focal point. It pairs a thin 0.110-inch front blade with an unilluminated, matte black square-notch rear blade designed to absorb distracting reflections and isolate your visual focus on the threat. Machined from solid steel and protected by a durable phosphate coating, the entire assembly effortlessly survives the severe g-forces of slide cycle recoil and aggressive holster friction. Additionally, the front face of the rear sight features a steep, hard-angled shelf optimized for emergency, one-handed slide operation against a belt, boot, or vertical barrier.