Vism Ncstar GEN3 Ultimate Sighting System USS 3-9X40mm AR-15 scope combo with Red Micro Dot optic. Scope calibrated for AR15, M4, rifle 1½” centerline height. Micro Dot Sight is mounted directly to the scope body inside an armored micro dot mount. AR 15 Scope features a modern new look and enhanced features with Illuminated MIL-Dot reticle Red & Blue with Electronic control panel. Scope has Bullet Drop Compensator, large magnification ring, with quick focus ring, uses standard AA battery, and a quick release Picatinny mount. Includes a Red Dot optic DDAB mounted directly to the top of the scope body, inside an armored micro dot mount. The Electronic Control Panel turns On/Off the illuminated MIL-Dot reticle, adjust the brightness level of the illuminated MIL-Dot reticle, changes the reticle color from Blue or Red. The GEN3 Ultimate Sighting System whole Ocular body functions as a large Magnification ring. There is also an adjustable reticle focus ring at the end of the ocular lens. Low Profile Elevation Turret with a Bullet Drop Compensator (BDC) calibrated for M193 55gr. FMJ Mil-Spec ammo. Uses a single standard AA battery (included) for long battery life and easy use. Auto Locking Quick Release Mount, fits Weaver/ Picatinny/ MIL-STD 1913 type rails.