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Product DescriptionWilliams' Click-Adjustable Fire Sights are high-visibility daytime sights featuring green rear twin-fiber optic beads that make it easy to pick up the red front sight. The more natural light, the brighter the beads. Obtains a faster sight target picture. CNC machined aircraft strength aluminum. The Williams sight uses a small diameter fiber optic rod held in a steel sight base, as opposed to the many plastic bases on the market. In use, the red rear bead is very visible, even against a dark background. This aluminum sight fits S&W M&P and .22 LR.