Replacement sight sets give your 10/22A(R) a longer sight radius for improved accuracy potential, plus the same sight picture as an AR-15/M16 with military-issue sights. Installation requires no gunsmithing, no drilling/tapping, and no permanent alterations to the rifle. Rear sight mounts using the factory-provided holes for a scope base. All-steel front sight assembly has a standard detent-locking M16 post surrounded by protective ears that guard it from damage and misalignment. User may substitute any aftermarket post that replaces the standard A2. For even greater precision, the TSR200 set's rear sight has a single aperture that uses a rotating dial for fine adjustments in eleva Mfg: Tech Sights SPECS: Front Sight - steel, blued, matte finish, .53" (13.4mm) wide, .90" (23mm) high. Rear Sight - aluminum, black finish. 2.9" (7.4cm) long, .94" (24mm) tall. Sold as front/rear sight sets. Includes mounting screws.