Monstrum Tactical 1-4x20 Rifle Scope with Rangefinder Reticle Tactical rifle scope providing crystal clear targeting at 1-4x magnification, with a 20mm objective diameter and an eye relief of 3.5-3.8 Inches Glass rangefinder reticle for on-the-fly range estimation and long distance targeting Lever controlled reticle illumination in both red and green with multiple brightness intensities Includes set of 1 inch, medium profile, scope rings for optimum scope placement Aircraft grade aluminum construction with a 1 inch sealed, nitrogen charged tube for resistance to water and fog