4x20 Electro Sight Carry handle Scope is specifically designed for M-16 & AR-15 Rifles. Features a built-in bullet drop compensation system that is calibrated to 500 yards in 100 yards increments. It has an integrated base that easily mounts on to the inside track of a rifles carry handle. At the base of the integrated mount is a peep sight that allows you to use the rifles iron sight. This upgraded model now features a standard black Mil-Dot dot reticle, an improved design and fully coated crisp clear optics. Includes lens cloth. Backed by BARSKA's 1 Year warranty. A true visionary breakthrough with this multi-reticle panoramic sight with 4 different reticles for optimum versatility. Featuring a high intensity diode for super bright reticle, 7-position rheostat for variable brightness, panoramic screen, superior qua