Vortex Crossfire HD 3-9x 40mm Rifle Scope - Whether threading shots through dense timber or dialing in at extended range, Crossfire HD delivers sharper detail and improved light transmission, giving you the confidence to own any hunt. HD Optical System: Optimized with select glass elements to deliver exceptional resolution, cut chromatic aberration, and provide outstanding color fidelity, edge-to-edge sharpness, and light transmission. Fully Multi-Coated Lenses: Anti-reflective coatings on all air-to-glass surfaces provide increased light transmission for greater clarity and low-light performance. Fast-Focus Eyepiece: Allows for quick and easy reticle focusing. Aircraft Grade Aluminum: Constructed from a solid block of aircraft-grade aluminum for strength and rigidity. Low-Glare Matte Black Anodize: Corrosion and wear resistant anodization provides low-glare matte surface and helps camouflage the shooter's position. Waterproof: Designed to withstand harsh weather conditions. Fogproof: Designed to withstand a wide range of temperatures. Shockproof: Designed to withstand the highest levels of recoil and impact.