With a redesigned HD optical system that cuts inches and ounces off the original platform, the new Spitfire(TM) HD Gen II 3x and 5x models are a shooter's dream come true. Choose your ideal magnification and mounting height, then rely on the BDC-style reticle to subtend with most popular 5.56 cartridges for quick holdovers at known distances, keeping you locked on target. The Spitfire? HD Gen II 5x model comes equipped with an MRDS mounting platform for use with Vortex(R) Viper(R) or Venom(R) MRDS. HD Optical System Optimized to deliver exceptional resolution, cut chromatic aberration, and provide outstanding edge to edge sharpness and light transmission Brightness Settings 12 levels Night-Vision Compatibility The lowest 2 settings are night-vision compatible. The AR-BDC4 Reticle is built to get the most out of the 5.56 cartridge in your AR, providing both rapid target acquisition and the tools for holdovers out to 650 yards Waterproof O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments. Shockproof Rugged construction withstands recoil and impact Fogproof Nitrogen gas purging prevents internal fogging over a wide range of temperatures Nitrogen Gas Purged Gas purged and o-ring sealed delivering waterproof, fogproof performance Low-Glare Matte Black Anodized Corrosion and wear resistant anodization provides low-glare matte surface and helps camouflage the shooter's position Compact, Lightweight Design Rugged construction that's still compact, with a lightweight form-factor Included : Rubber Lens Covers T-10 Torx Multi-Tool Multi-Height Mount System - Lower 1/3 Co-Witness Height and Low Mount Height Lens Cloth CR 2032 battery