One of the cheapest and coolest tritium sights on the market. Even cheaper than Glock tritium sights. Minimalist yet functional. The rear sight is black with grooves, and the front sight has a clear white dot during the day. In the dark, the tritium on the front sight is bigger than those on the rear sight, making it easy and quick to check if the "index" is properly maintained. The installation is quick and straightforward. In Gen3, the rear sight tail does not require any fitting or filing.