OPTICAL FEATURES
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.
First Focal Plane Reticle	Scale of reticle remains in proportion to the zoomed image. Constant subtensions allow accurate holdover and ranging at all magnifications.
Glass-etched Reticle	Protected between two layers of glass for optimum durability and reliability.
Illuminated Reticle	Provides precise aiming under low-light conditions.

CONSTRUCTION FEATURES
Tube Size	30 mm diameter.
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 the riflescope 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.
Tactical-Style Turrets	Exposed 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.

INTERNAL MECHANISM DESIGN FEATURES
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.

CONVENIENCE FEATURES
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. US Patent 7,937,879
Fast Focus Eyepiece	Allows quick and easy reticle focusing.

Magnification	4-16 x
Objective Lens Diameter	50 mm
Eye Relief	4.0 inches
Field of View	27.4-7.4 feet/100 yards
Tube Size	30 mm
Turret Style	Tactical CRS Zero Stop
Adjustment Graduation	.1 mrad
Travel per Rotation	5 mrad
Max Elevation Adjustment	21 mrad
Max Windage Adjustment	21 mrad
Parallax Setting	50 yards to Infinity
Length	13.7 inches
Weight	22.4 ounces

Vortex Viper PST 4–16x50 FFP Riflescope EBR-1 MRAD Reticle

The Vortex Viper PST series (Precision Shooting Tactical) comes at a democratic price but holds features of most sophisticated riflescopes. One-piece 30mm tube made of aircraft-grade aluminum provides rigidity and ample room for long-range elevation and wind adjustment. Matching reticle and turret measurements allow accurate, fast dialing of shots. This Vortex Viper PST model comes with first focal plane (FFP) reticle. Extra-low dispersion glass ensures maximum sharpness; XR multi-coated lenses deliver light transmission and bright images even in low light.

EBR-1 Reticle (MRAD)

The EBR-1 (Enhanced Battle Reticle) is a hashmarked ranging reticle using mrad based subtension lines for ranging, holdover, and windage corrections. First focal plane reticle.