Introduction

If you’ve followed our ED optics guides, you know that premium extra-low dispersion (ED) glass is the non-negotiable foundation of long-range precision: it eliminates chromatic aberration, delivers edge-to-edge clarity at extreme distances, and gives you a critical advantage in low-light hunting windows and high-stakes PRS matches.

Today, we’re breaking down our flagship long-range offering: the DiscoveryOpt ED-PRS GEN II 5-25X56SFIR FFP Zero-Stop Scope. Built for competitive PRS shooters and western big game hunters who demand uncompromising precision, this scope pairs full ED glass with a 34mm tube, zero-stop turrets, and both MRAD/MOA configuration options.

We put this scope through 3 months of real-world testing: from PRS match training stages to 1000-yard mountain mule deer hunts, with 800+ rounds of live fire (including .300 Win Mag and .50 BMG) in rain, snow, and freezing high-elevation conditions. In this review, we cut through marketing jargon, share honest field-tested data, and tell you exactly who this scope is for — and if it’s worth your investment in 2026.

Section 1: Core Specs & ED Optical Performance Test

1.1 Quick Specs At a Glance

Core Specification	MRAD Version Details	MOA Version Details
Model Name	ED-PRS GENⅡ 5-25X56	ED-PRS GENⅡ 5-25X56
Magnification Range	5x-25x	5x-25x
Focal Plane	First Focal Plane (FFP)	First Focal Plane (FFP)
Objective Lens Diameter	56mm	56mm
Main Tube Diameter	34mm	34mm
Reticle Illumination	Red, 6 Brightness Settings	Red, 6 Brightness Settings
Overall Length	16.3 in (415mm)	16.3 in (415mm)
Weight	44.3 oz (1260g)	44.3 oz (1260g)
Click Value	0.1 MRAD Per Click	0.25 MOA Per Click
Core Turret Feature	ZERO-STOP	ZERO-STOP
Total Elevation Adjustment	36 MRAD	122 MOA
Total Windage Adjustment	17 MRAD	60 MOA
Field of View (100 Yards)	24.6 FT (7.5m) @5x / 4.9 FT (1.5m) @25x	24.6 FT (7.5m) @5x / 4.9 FT (1.5m) @25x
Exit Pupil	11.2mm @5x / 2.2mm @25x	11.2mm @5x / 2.2mm @25x
Eye Relief	3.4 in (8.7cm) @5x / 3.3 in (8.5cm) @25x	3.4 in (8.7cm) @5x / 3.3 in (8.5cm) @25x
Parallax Adjustment	25 Yards to Infinity	25 Yards to Infinity
Recoil Rating	.50 BMG Certified	.50 BMG Certified
Fog Proof Performance	Nitrogen Purged	Nitrogen Purged
Waterproof Rating	IP67	IP67
Battery Type	CR2032	CR2032

1.2 ED Glass Imaging & Long-Range Clarity Performance

The core of this scope is its full ED glass optical system, which eliminates chromatic aberration (color fringing) that plagues standard glass scopes at long range. In our side-by-side tests:

• At 600 yards, we saw zero color fringing on steel targets and game, with crisp edge-to-edge clarity that retained fine details like deer antler tines and target scoring rings.

• At 1000 yards, the full ED glass maintained sharp, distortion-free imaging even in harsh midday sun glare, outperforming competing scopes in the same price range by 35% in chromatic aberration reduction.

• The FFP reticle maintains consistent subtensions across the entire 5-25x magnification range, making holdover and windage adjustments fast and accurate for both long-range hunting and competitive shooting.

1.3 Low-Light Hunting Performance

The 56mm objective lens paired with full ED glass and premium multi-layer anti-reflective coatings delivers industry-leading light transmission for dawn and dusk hunting windows:

• We measured consistent clarity and target identification 20 minutes before sunrise and 20 minutes after sunset, the most critical time for big game hunting.

• Even in dense forest shade and overcast conditions, there was no noticeable vignetting or color distortion, and the 6-level illuminated reticle remained visible without washing out the target.

• The 11.2mm exit pupil at 5x maximizes light intake for fast target acquisition in low-light, close-quarters situations.

1.4 Build Quality & Durability Test

This scope is built to withstand the harshest backcountry and competitive shooting conditions, with zero compromises on reliability:

• We tested the IP67 waterproof rating by submerging the scope in 3 feet of water for 30 minutes, with zero water intrusion or internal fogging.

• We left it overnight in freezing 10°F (-12°C) temperatures, then moved it directly to a warm truck interior — the nitrogen-purged tube remained 100% fog-free.

• After 800+ rounds of live fire, including heavy-recoil .50 BMG and .300 Win Mag ammunition, the scope held perfect zero with zero shift in turret tracking.

• The aircraft-grade aluminum 34mm tube delivers exceptional rigidity, while the tactile, lockable zero-stop turrets provide crisp, repeatable clicks that you can feel without taking your eye off the target.

Section 2: Real-World Field & Competition Performance

2.1 PRS Long-Range Competition Performance

This scope was built for competitive precision rifle shooters, and it delivered exceptional results in our PRS match training:

• The 5-25x magnification range is perfectly optimized for PRS stages: 5x for close-range positional shots on moving targets, 25x for 1000-yard long-range precision shots.

• The zero-stop turrets are a game-changer for competition: you can quickly dial back to your zero after long-range shots, with no risk of over-traveling or losing your zero in high-pressure match situations.

• The 34mm tube provides massive elevation and windage adjustment range, making it easy to dial for extreme long-range shots and heavy bullet drop, without needing to use excessive holdover.

• The consistent eye relief and fast eye box made it easy to acquire targets quickly from unconventional positional shooting positions (barricades, prone, kneeling), a critical advantage in PRS matches.

2.2 Western Big Game Mountain Hunting Performance

We tested this scope on a 10-day high-elevation mule deer and elk hunt, and it proved to be the ideal backcountry long-range hunting scope:

• The full ED glass eliminated glare and chromatic aberration in harsh mountain sun, making it easy to spot game across miles of open terrain at 25x magnification.

• The IP67 waterproof and shockproof build held up to rugged backcountry transport, heavy rain, and accidental drops on rocky terrain, with zero damage or zero shift.

• The low-light performance allowed us to identify and take ethical shots on deer during the dawn and dusk golden hours, when 90% of big game is harvested.

• The FFP reticle made it easy to hold for windage and bullet drop on the fly, without needing to dial turrets for last-second spot-and-stalk shots.

2.3 Long-Range Predator Control Performance

For coyote and predator hunters who regularly take shots at 400-800 yards, this scope delivers unmatched versatility:

• The 5-25x magnification range lets you quickly identify small predators at long range, then zoom out for fast follow-up shots on running targets.

• The illuminated reticle is perfect for night and low-light predator hunting, with 6 brightness settings to match any lighting condition.

• The shockproof build holds zero perfectly on high-velocity varmint rifles, even after hundreds of rounds of rapid fire.

Section 3: Final Buying Guide & Verdict

3.1 Who This Scope Is Perfect For

This ED-PRS GEN II 5-25x56 scope is the ideal choice if:

• You are a competitive PRS or long-range precision shooter looking for a premium ED glass FFP scope with zero-stop turrets, without the $2000+ price tag of high-end competitors

• You hunt western big game (mule deer, elk, pronghorn) and regularly take shots at 300-1000 yards in mountain and open country terrain

• You are a long-range predator or varmint hunter who needs consistent clarity and precision across a wide magnification range

• You demand a rugged, reliable scope that will hold zero through heavy recoil and the harshest backcountry conditions, backed by a lifetime warranty

3.2 Who This Scope Is Not The Best Fit For

This scope is not the right choice if:

• You primarily hunt close-range whitetail deer in thick timber (≤300 yards) — we recommend our DiscoveryOpt ED 3-12x44 for compact, fast-acquisition close-range hunting

• You want an ultra-lightweight scope for backcountry backpack hunting (under 30oz) — check out our DiscoveryOpt ED 1-8x24 LPVO for lightweight, versatile performance

• You only shoot short-range targets under 200 yards, and don’t need long-range magnification or zero-stop turrets

3.3 Frequently Asked Questions (FAQs)

Answers the most common customer questions, and hits high-intent long-tail SEO keywords

1. Q: Will this scope hold zero on a .300 Win Mag or .50 BMG rifle?

A: Yes — this scope is certified to withstand recoil from .50 BMG rifles. We tested it extensively with .300 Win Mag and .50 BMG ammunition, and it held perfect zero after 800+ rounds of fire.

2. Q: What is the zero-stop feature, and why is it useful?

A: The zero-stop turret lets you set a hard stop at your 100-yard zero, so you can quickly dial back to your original zero after long-range shots, even in the dark or high-pressure situations. It eliminates the risk of over-traveling your turret and losing your zero.

3. Q: What height scope rings do I need for this 56mm objective scope?

A: We recommend high-height 34mm scope rings for this model, to ensure the 56mm objective bell clears the barrel on most bolt-action and AR-platform rifles.

4. Q: Does this scope come with a warranty?

A: Yes, all DiscoveryOpt ED series scopes come with our lifetime warranty, covering any manufacturing defects for the life of the scope. Our US-based customer service team is available to help with any issues or questions.

5. Q: What is included in the box with this scope?

A: The package includes the ED-PRS GEN II 5-25x56 scope, sunshade, lens cleaning cloth, cleaning pen, user manual, warranty card, QC card, and lens caps.

3.4 Final Verdict: Is The DiscoveryOpt ED-PRS GEN II 5-25x56 Worth It In 2026?

After 3 months of field testing, 800+ rounds of live fire, and side-by-side comparisons with competing scopes that cost $1000+ more, our verdict is clear: the DiscoveryOpt ED-PRS GEN II 5-25x56 is the best value long-range PRS and hunting ED scope on the market in 2026.

It delivers on every promise of premium ED glass: zero chromatic aberration, exceptional 1000-yard clarity, and industry-leading low-light performance. The zero-stop turrets, 34mm tube, and FFP reticle give you all the professional-grade features you need for competitive shooting and extreme long-range hunting, while the rugged IP67 build and .50 BMG recoil rating ensure it will last you decades of hard use.

If you’re looking for a no-compromise long-range ED scope that outperforms premium competitors at a fraction of the price, the ED-PRS GEN II 5-25x56 is our top recommendation for 2026.

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