The VX-4.5HD Service Rifle scope delivers a sharp image at 4.5x magnification the highest magnification allowed for NRA Service Rifle competitions and a flat, true-to-life image at low power, making off-hand shooting quick and easy. Features advanced optical system, custom dial system, second focal plane, Zero Stop, illuminated and motion sensor technology. Length 10.76" Proofs Fog/Shock/Waterproof Series Service Rifle Competition Weight 13.40 oz Reticle Illuminated FireDot Bull-Ring Objective 24mm Eye Relief 3.70" - 3.80" Coating Type Waterproof, Fogproof Field Of View 26.20 - 123.20 ft @ 100 yds Magnification 1-4.5x Tube Diameter 30mm Parallax Adjustment 150 yds