Monstrum Tactical 4x30 Ultra-Compact Rifle Scope with Illuminated Mil-dot Reticle Ultra compact scope providing crystal clear targeting at 4x magnification, with a 30mm objective diameter and an eye relief of 3 inches Glass mildot reticle with mildot markings for on-the-fly range estimation and long distance targeting, in both red and green illumination with multiple brightness intensities, for clean sight picture regardless of lighting or environment Integrated rail mount fastens securely to any flat top Weaver or Picatinny rail equipped rifle Only 6 inches in length and 12 ounces in weight, ultra lightweight and compact in design