Monstrum Tactical 3x30 Ultra-Compact Rifle Scope with Illuminated Range Finder Reticle High optical clarity at 3 times magnification and 30 mm objective diameter Glass range finder reticle for on-the-fly range estimation and long distance targeting Dial controlled reticle illumination in both red and green with multiple brightness intensities, for clean sight picture regardless of lighting or environment Only 6 inches in length and 12 ounces in weight, ultra lightweight and compact in design Integrated rail mount fastens securely to any flat top Weaver or Picatinny rail equipped rifle