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PST-5251 Vortex Optics Viper PST Gen II 5-25×50 SFP With EBR 4 Reticle (MOA)

The PST-5251 Vortex Optics Viper gives professional shooters the best advantage when it comes to close-quarter and long-range shots. Easily adjust illumination with the dial for streamlined performance. Features such as the easy access adjustment knob make for a functional, intuitive, and detailed hold point while staying uncluttered for optimal view. Get a clean and sleek design with easy to maneuver features all in one with the PST-3158 Vortex Optics Viper.


SKU: PST-5251 Category:

This updated favorite hands an unfair advantage to shooters who seek to keep the upper hand in every situation from close quarters to long-range shots. The illumination dial is cleanly integrated into the side focus adjustment knob for easy access and streamlined performance. The glass-etched reticle offers shooters highly functional, intuitive, and detailed hold points, yet remain uncluttered for optimal viewing and feature 10 intensity levels with off positions between each setting

Included In The Box:

  • VIP Unconditional Lifetime Warranty
  • CR2032 battery
  • Lens cloth
  • 2 mm hex wrench
  • 3” Sunshade

PST-5251 Vortex Optics Viper PST Gen II 5-25x50 SFP with EBR 4 Reticle (MOA) 2

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.
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.
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.


Internal Mechanism Design Features

RZR Zero Stop Zero Stop mechanism prevents the turret from dialing below sight-in range.
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

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.
Built-In Accuracy Features Matching (MRAD or MOA) turrets and reticles facilitate fast and accurate shooting at extended ranges. The patented fiber optic Radius Bar visually assists tracking turret rotations. US Patent 7,937,879


Magnification 5-25 x
Objective Lens Diameter 50 mm
Eye Relief 3.4 in
Field of View 24.1-4.8 feet/100 yards
Tube Size 30 mm
Turret Style Tactical
RZR Zero Stop
Adjustment Graduation 1/4 MOA
Travel per Rotation 25 MOA
Max Elevation Adjustment 70 MOA
Max Windage Adjustment 35 MOA
Parallax Setting 25 yards to Infinity
Length 16 inches
Weight 31.2
Product Manual (PDF)  
Product Manual 2 (PDF)  

Viper PST GEN II 5-25 x 50 Dimensions

PST-5251 Vortex Optics Viper PST Gen II 5-25x50 SFP with EBR 4 Reticle (MOA) 3
L1 L2 L3 L4 L5 L6
16.0 2.25 2.50 6.85 5.6 3.75


H1 H2
2.3 1.8


Dimensions measured in inches.

EBR-4 Reticle (MOA)

Hash-marked ranging reticle using MOA or MRAD based subtension lines for ranging, holdover, and windage corrections. Letters refer to reticle subtensions listed in the chart below.

PST-5251 Vortex Optics Viper PST Gen II 5-25x50 SFP with EBR 4 Reticle (MOA) 4

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