Fully multi-coated with anti-reflective lens coatings for brighter views; Nitrogen gas purging with o-ring seals delivers fogproof, waterproof performance; Shockproof construction withstands recoil and impact; Rugged, one-piece aluminum alloy chassis; Hard-anodized black matte finish; Unlimited eye relief for rapid target acquisition; Lower 1/3 co-witness cantilever mount or low ring mount option