"The Vortex Optics Viper HS-T 4-16x44 Riflescope with VMR-1 MRAD Reticle combines a high-transmission lens system and weather-sealed 30mm scope tube to create a versatile optic for close to mid-range targeting. Vortex uses optically indexed Extra-low Dispersion (HD) glass elements and fully multicoated optics, with their proprietary XR anti-reflective lens coatings, to maximize the scope's light gathering and transmission ability. This combination of optics and coatings minimizes chromatic aberration and preserves overall clarity with the resulting images being bright and sharp throughout the zoom range. This Viper HS-T scope is configured with a VMR-1 MRAD duplex reticle in the second focal plane (SFP). Putting the reticle on the SFP keeps it in focus as the zoom is pulled in or pushed out, eliminating the need to re-focus it after every zoom adjustment. The VMR-1 MRAD pattern is a duplex-style variant with medium-weight posts at three, six, nine and twelve o'clock that taper to a fine crosshair. Stadia lines on the central crosshairs aid in long-distance ranging, calculating hold-over and ballistic-drop compensation. Complementing the Viper HS-T's shooter-friendly design and image quality is the build quality to match. The scope housing is machined from a solid piece of aluminum, anodized with a corrosion-resistant hard coat and filled with argon gas to ensure water and fogproof performance. All exposed lens surfaces are finished with Vortex's proprietary Arm|XD Lens Elements: Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images|XR Fully Multi-Coated: Proprietary coatings increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces|Second Focal Plane Reticle: Scale of reticle maintains the same ideally-sized appearance. Listed reticle subtensions used for estimating range, holdover and wind drift correction are accurate at the highest magnification|Single-Piece Tube: Maximizes alignment for improved accuracy and optimum visual performance, as well as ensures strength and waterproofness|Aircraft-Grade Aluminum: Constructed from a solid block of aircraft-grade aluminum for strength and rigidity|Waterproof: O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments|Fogproof: Argon gas purging prevents internal fogging over a wide range of temperatures|Shockproof: Rugged construction withstands recoil and impact|Hard Anodized Finish: Highly durable low-glare matte finish helps camouflage the shooter's position|ArmorTek: Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt|Exposed Tactical-Style Turrets: Provide fast, accurate and easily read elevation and windage adjustments|Side Focus: Adjustment located on riflescope's left side and is easily accessible from shooting position. Provides optimal image focus and parallax removal|CRS Zero Stop: Customizable Rotational Stop (CRS) aids in return to zero after dialing temporary elevation correction|Precision-Force Spring System: Uses premium components in the erector-spring system to ensure maximum repeatability and ease of adjustment|Precision-Glide Erector System: Uses premium components in the zoom lens mechanism to ensure smooth magnification changes under the harshest conditions|MAG-View Fiber Optic: Provides a highly visible reference point for the magnification setting|Radius Bar: Fiber optic turret rotation indicator provides a highly visible and tactile point of reference for turret rotations|Fast Focus Eyepiece: Allows quick and easy reticle focusing"