The Vortex Viper PST Gen II 5-25×50 EBR-4 MOA is a variable-power riflescope designed for precision long-range shooting, tactical applications, and competitive use. This second-generation Viper PST pairs a 50mm objective lens with 5-25x magnification and an MOA-based reticle system. The EBR-4 reticle uses Minute of Angle markings, allowing shooters to make windage and elevation adjustments that correspond directly to the scope’s turrets.
This scope suits precision rifle shooters who dial their turrets for elevation and need consistent, precise adjustments. The wide magnification range works from mid-range field shooting at lower power up to confirmed hits at extended distances when cranked to 25x.
Key Facts
Model: Vortex Viper PST Gen II 5-25×50 EBR-4 MOA
Magnification Range: 5-25x
Objective Lens Diameter: 50mm
Reticle Type: EBR-4 MOA
SKU: vortex_viper_pst_gen_ii_PST-5251
Why Choose the EBR-4 MOA Reticle
The EBR-4 reticle is an MOA-based holdover system that offers hash marks and numbered graduations across both the vertical and horizontal axes. Each mark corresponds to a specific Minute of Angle measurement, which simplifies range estimation and wind hold calculations. For shooters who already think in MOA terms, the EBR-4 eliminates mental math during the shot.
MOA reticles pair naturally with MOA turret adjustments. When your reticle and your turrets speak the same language, the system becomes faster and more intuitive under time pressure. That consistency matters in competitions and in any scenario where you need to dial for distance or hold for wind without second-guessing your math.
5-25x Magnification and 50mm Objective
The 5x low end provides a wide field of view for target acquisition and positional transitions. At 25x, the upper end delivers the magnification needed to resolve small targets and spotting impacts at longer ranges. That five-fold zoom range makes the PST Gen II 5-25×50 adaptable to different shooting disciplines without swapping optics.
A 50mm objective lens gathers enough light for clear images in variable conditions, though performance in low light depends on other factors not specified here. Objective diameter balances light transmission with the added weight and mounting height that larger lenses require. Send us a message to confirm specific dimensions and mounting requirements for your rifle.
What to Pair With This Optic
The Vortex Viper PST Gen II 5-25×50 requires a sturdy scope mount that can handle recoil and hold zero over repeated shooting sessions. Choose rings or a one-piece mount with the correct tube diameter and height for your rifle and shooting position. The scope’s weight and length also matter for balance, especially on lighter rifle platforms.
This scope works well on bolt-action precision rifles chambered in .308 Winchester, 6.5 Creedmoor, and similar cartridges that benefit from precise adjustments at distance. It also suits gas-gun platforms built for accuracy, though you should verify compatibility with your specific setup. Western Sport stocks a range of riflescopes and can help match the right glass to your rifle.
Ordering from Western Sport
Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: What is the difference between the EBR-4 MOA and MRAD reticles in the Viper PST Gen II?
A: The EBR-4 MOA uses Minute of Angle graduations, while MRAD reticles use milliradian measurements. MOA divides a circle into 21,600 minutes, with each MOA equaling roughly one inch at 100 yards. MRAD divides the circle into 6,283 milliradians, with each milliradian subtending one meter at 1,000 meters. Choose the system that matches how you already calculate distance and wind.
Q: Does the Vortex Viper PST Gen II 5-25×50 work on a .308 bolt gun?
A: Yes, the Viper PST Gen II 5-25×50 pairs well with .308 Winchester bolt-action rifles and similar precision cartridges. The scope’s magnification range and MOA reticle suit the effective range and ballistic curve of .308. Confirm that your chosen mount provides adequate eye relief and mounting height for your stock and shooting position.
Q: Can I use this scope for PRS competitions?
A: Yes, the Viper PST Gen II 5-25×50 is commonly used in Precision Rifle Series and similar competitions. The 5x low end aids fast target transitions, and the 25x top end resolves distant steel. The EBR-4 MOA reticle supports holdovers and turret dialing, which are both used in match settings. Many competitors run this exact model.
Q: What rings or mount do I need for the Viper PST Gen II?
A: The tube diameter and mounting specifications should be confirmed before purchasing rings or a mount. Western Sport can help identify the correct size and height for your rifle. Send us a message to discuss mounting options and ensure proper fit with your action and stock.
Q: Is the Vortex Viper PST Gen II 5-25×50 covered by a warranty?
A: Vortex offers warranty coverage on its optics, though the specific terms are set by the manufacturer.
This item is out of stock. These are on the shelf today and ship or transfer the same way. Not sure which is the right swap? Call 817-393-4000 and we will tell you straight.
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