This Night Fision rear sight is a U-notch tritium sight built for the Glock 20/21 from Night Fision (brand part no. GLK002007YGZG), finished with a yellow tritium insert. It’s sold as a rear sight only, giving Glock 20/21 owners a way to upgrade or replace just the rear half of their sight picture without swapping the front sight. The U-notch design is a common choice for shooters who prefer a wider rear aperture for faster target acquisition.

Key Specifications

• A rear sight built for the Glock 20/21.
• Uses a U-notch sight picture.
• Tritium insert finished in yellow.

Frequently Asked Questions

Is this a front or rear sight? This is a rear sight.

What sight picture does it use? A U-notch design.

Buy the Night Fision U-Notch Rear Sight

Upgrade your Glock 20/21 rear sight with this Night Fision U-notch tritium option. It ships fast from our Lubbock, Texas gun shop, and our gun sights selection has more gun sights for your pistol.