Monstrum Tactical Rifle Scope with Illuminated BDC Reticle and 30mm Offset Mount Tactical rifle scope providing crystal clear targeting at 1.5-4x magnification, with a 30mm objective diameter and a long eye relief of 3.5-3.8 Inch Glass BDC reticle for on-the-fly range estimation and long distance targeting Dial controlled reticle illumination in both red and green with multiple brightness intensities Includes 30mm offset Cantilever dual ring mount with integrated top rails 10.1 Inch in length and 1.5 pounds in total weight, aircraft grade aluminum construction, with a nitrogen charged, water resistant design