When shooting long distances in which bullet drop and wind drift composition are crucial, the Vortex Viper HS LR 4-16x50mm Rifle Scope makes an excellent choice. The Dead-Hold BDC reticle with customized hashmark design helps eliminate guesswork on holdover and windage corrections, making it perfect for hunting/shooting at varying ranges where estimating holdover is a concern. The Viper HS LR features an exposed, target-style elevation turret that's built for dialing elevation at extended ranges, plus CRS Zero Stop for easy return to zero. MAG-View fiber optic technology provides a highly visible reference point for magnification setting, and a patented Radius Bar fiber optic turret rotation indicator provides a highly visible and tactile point of reference for turret rotations. As with all Vortex Viper HS scopes, top quality optics are standard and feature extra-low dispersion glass and proprietary XR coatings for clear, bright images, superior edge to edge clarity and true color. The single-piece, hard anodized tube features a capped windage turret that maintains the Scope's sleek lines and prevents it from hanging up on clothing, rifle cases or scabbards. Rugged construction, O-ring seals and Argon purging ensure shockproof waterproof, fogproof performance for every situation. Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images XR proprietary coatings increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt Second Focal Plane Dead-Hold BDC with customized hashmark design Fast focus eyepiece allows quick and easy reticle focusing Exposed Tactical Elevation Turret provides fast, accurate and easily read elevation adjustments Capped windage turret prevents hang-ups on clothing, rifle cases or scabbards CRS Zero Stop aids in return to zero after dialing