The Vortex Viper HD 5-25x50 VMR-3 MOA Riflescope is a scope designed for exceptional optical performance. The HD Optical System features fully multicoated lenses and an argon gas purged tube to ensure high image clarity, resolution and sharpness. Its illuminated reticle aids with long-range accuracy at dawn and dusk, when game is most active, and its rugged construction stands up to all kinds of harsh conditions.