Vortex Viper HS 4-16x50 LR Riflescope Want to extend your effective shooting range at distances where bullet drop and wind drift become critical? Take a look at the Viper HS LR riflescope. The LR stands for long range — and we mean it. This riflescope features an exposed target-style elevation turret built for dialing elevation at extended ranges. The capped windage turret maintains the scope’s sleek lines and prevent it from hanging up on clothing, rifle cases or pack scabbards. Viper HS LR riflescopes feature an advanced optical system highlighted with a 4x zoom range for magnification versatility. A forgiving eye box with increased eye relief gets shooters on target quickly and easily. Built on an ultra-strong 30mm one-piece machined aluminum tube for increased windage and elevation travel and optimal adjustment. Optical Features XD Lens Elements Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images. XR Lens Coatings Vortex proprietary XR fully multi-coated lens coatings increase light transmission for maximum brightness. Construction Features 30 mm Tube Provides greater strength and wider adjustment lattitude. One-Piece Tube Maximizes alignment for improved accuracy and optimum visual performance as well as strength and waterproofness. Aircraft-Grade Aluminum Construction from a solid block of aircraft-grade aluminum delivers increased strength and rigidity. Waterproof O-ring seals prevent moisture, dust, and debris from getting inside the tube for reliable performance in all environments. Fogproof Filled with argon gas to inhibit internal fogging over a wide range of temperatures. Shockproof Lenses are locked in place, fore and aft, with machined locking rings to remain in perfect alignment and withstand recoil and impact. Hard Anodized Finish Hard-coat anodization is durable; the low-glare matte helps camouflage the shooter’s position. ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Convenience Features CRS Zero Stop Customizable Rotational Stop (CRS) prevents dialing more than one rotation below your zero so you don"t lose the zero when dialing large amounts of elevation corrections. Exposed Elevation Turret Open type elevation turret with 1/2 MOA s and 24 MOA per turn allows rapid, accurate dialing of hold over corrections when desired.