About the AmeriGlo GL203 i-Dot Night Sight Fits Glock 20/21 Tritium Green w/Orange OutlineThe AmeriGlo iDot sight set replaces the factory sights and utilizes a dot over dot configuration. These sights are designed for quick sight alignment in low light conditions. The front sight is a single tritium dot with an orange outline. The rear sight is a single green tritium dot with with a white outline.
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