The Trijicon AccuPoint 3-18x50 is a variable-magnification riflescope with a second focal plane green dot MOA ranging reticle. Illumination is battery-free, powered by fiber optic and tritium that auto-adjust to ambient light. The 30mm main tube requires 30mm rings. Features: 3-18x50 variable magnification, second focal plane Green dot MOA ranging reticle Battery-free illumination (fiber optic plus tritium, auto-adjusting) 30mm main tube (requires 30mm rings) 60 MOA windage and elevation, 1/4 MOA clicks Exposed return-to-zero turrets Ships with flip caps, sunshade, and scope coat This is a long-range riflescope, not a red dot. Requires 30mm rings (sold separately).