Trijicon ACOG Rifle Scope 4x 32mm LED Illuminated Red Crosshair 223 Remington Reticle with 3.25 MOA RMR Type 2 Red Dot Sight and Colt Knob Thumbscrew Mount Matte Black

From MidwayUSA

From the legendary ACOG family of products, the LED ACOG is the first to offer user-selectable brightness controls. Users can select from six adjustable brightness levels with an "off" between each setting, allowing the operator to determine how much to illuminate the reticle - even in transitional lighting. Powered by a single AA battery, the LED ACOG can run for over 12,000 continuous hours (on setting #4). Like all ACOG models, it is forged from rugged 7075-T6 aircraft-aluminum, resulting in a nearly indestructible sighting system and electronics that offer outstanding reliability.