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Product DescriptionEliminates the need to line up front and rear sights, allowing you to aim faster and get shots off sooner. The Fastfire II mounts low and weighs a mere 1.6 oz. The metal housing is durable enough to perform on the slides of high-power semi-automatics, slug guns, shotguns, and high-power rifles. The lenses are precision-ground and polished to exacting geometries to virtually eliminate parallax. The dot brightness automatically adjusts with the natural lighting. Windage and elevation adjustments are lockable. Powered by a CR2032 battery that can supply up to five years of life.