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The XS Sight Systems Big Dot Tritium Front Sight with White Stripe Rear Sight is designed for Smith & Wesson M&p 22 Semi-Auto pistols. This sight is designed for fast sight acquisition in any lighting condition. The XS sights are low profile- snag free design that do not require gunsmith installation. The Express sights are designed with a Green Tritium dot in the front and a white vertical line in the rear sight. The front sight tritium insert is embedded in a flexible but strong white insert that will protect the tritium vial and give you the ability to shoot in bright light conditions.