Made of aircraft-grade aluminum, the Vortex Crossfire II 3 - 9 x 40 Riflescope features fully multicoated lenses with multiple antireflective coatings to increase light transmission and a fast-focus eyepiece that allows quick and easy reticle focusing. O-ring seals keep out moisture, dust and debris for reliable performance in most environments, while nitrogen gas in the barrel inhibits internal fogging. Capped reset turrets. Hard-coat anodization. Low-glare matte finish. Vortex Crossfire II 3 - 9 x 40 Riflescope Black, 40mm - Scopes at Academy Sports