Millett Sights Marksman SP Rear Only (Target .410) These sights from Millett feature a positive light-deflection serration and slant to eliminate glare. A knife-edge rear sight notch for extra-crisp target definition, and precision adjustments for windage and elevation with a positive, audible "click" that tells you the hardened screws and detentes are locked into their settings. It's quality you can feel and see in your marksmanship. Specifications: - Type: Rear Sight - Gun Model: Colt 1911