Product Description The Night Fision GLK-002-007-OGZG is a precision-crafted tritium rear night sight designed specifically for Glock 20 and Glock 21 pistols. Featuring a U-notch rear configuration, this sight delivers fast target acquisition in low-light and no-light conditions. The center tritium vial glows orange for immediate visual alignment, flanked by two white/green outer vials for a clear three-dot sight picture. Built from durable steel and engineered for a drop-in fit, this rear sight is an ideal upgrade for competitive shooters and self-defense professionals alike who demand reliable low-light performance from their Glock. Product Highlights Glock 20/21 Specific Fit: Engineered as a direct-fit replacement rear sight for Glock 20 and 21 pistols with no gunsmithing required. Tritium Illumination: Self-luminous tritium vials provide a bright, clear sight picture in complete darkness without batteries or external light sources. Orange Center Vial: High-visibility orange tritium center vial enables rapid sight alignment and faster target acquisition under any lighting condition. U-Notch Rear Design: The open U-notch configuration allows for a wide field of view and quicker sight acquisition compared to traditional square-notch sights. Durable Construction: Rugged steel housing ensures lasting durability and resistance to the demands of regular range use and everyday carry. Specs Brand: Night Fision Model: GLK-002-007-OGZG MPN: GLK002007OGZG UPC: 856386007269 Compatible Firearms: Glock 20, Glock 21 Sight Type: Rear Night Sight, U-Notch Vial Color: Orange Center / White-Green Outer Width: 4.50 in Length: 6.40 in Height: 1.00 in Weight: 0.07 lbs Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>