The Vortex Razor HD Gen II 4.5-27x56mm Waterproof Rifle Scope provides optimal image sharpness and brightness from edge to edge. These riflescopes engineered by the experts at Vortex feature 6x zoom range, a 34mm single-piece aircraft-grade aluminum tube, and a sophisticated L-Tec turret system. The Vortex Razor HD Gen II 4.5-27x56mm Shockproof Riflescope includes an Apochromatic objective lens system that uses index-matched lenses to correct color across the entire visual spectrum. The Vortex Razor HD Gen II 4.5-27x56mm Riflescope gives you unparalleled durability and performance with an accurate holdover and ranging at all magnifications.