Athlon Optics Argos HMR 4-20x50 SFP Riflescope
- Magnification Minimum: 5x
- Magnification Maximum: 20x
- Objective Lens Diameter: 50 mm
- Night vision: No
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A waterproof, argon-purged 4-20x50 scope with a zero stop turret at an accessible price point, though there is no review history yet to weigh against the spec sheet.
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ASIN: B08296ZBDTModel: Argos HMR 4-20x50Category: Rifle Scopes
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Overview
The Argos HMR is a 4-20x50 second focal plane riflescope with fully multi-coated optics and an argon-purged, waterproof and fogproof aluminum housing.
Argos positions this as an entry point into higher magnification hunting optics rather than a premium build, with a zero stop turret for returning to a saved setting after adjustments. There is not yet buyer review data to confirm field performance.
- 4-20x50 second focal plane riflescope
- Fully multi-coated optical system
- Aircraft-grade aluminum, waterproof and fogproof
- Precision zero stop turret
Who it's for
Suited to hunters wanting a mid-priced scope that covers close to long range work in one optic. Not the choice for anyone needing a first focal plane reticle, since subtensions here only hold true at max magnification.
Pros and cons
- 50mm objective lens for low light brightness
- Zero stop turret for fast return to a saved zero
- Argon-purged housing for waterproof, fogproof use
- Second focal plane reticle only reads true at max magnification
Performance notes
Fully multi-coated lenses are meant to cut reflected light and boost light transmission compared to single-coated glass, and the 50mm objective lens is sized to support that in low light. Because it is second focal plane, reticle subtensions are accurate only at the top of the 4-20x zoom range, so ranging with the reticle at lower power will be off.
Specifications
| Brand | Optics |
|---|---|
| Model | Argos HMR 4-20x50 |
| Dimensions & fit | |
| Objective Lens Diameter | 50 mmhigher than 69% of 309 rifle scopes |
| Item Weight | 1.31 poundshigher than 50% of 238 rifle scopes |
| Construction & materials | |
| Color | Black |
| Compatibility & installation | |
| Compatible Devices | Rifle |
| Included components | |
| Unit Count | 1 |
| Other details | |
| Magnification Minimum | 5x |
| Magnification Maximum | 20x |
| Night vision | No |
| Sport Type | Hunting |
| Reticle Type | Mil Dot |
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Frequently asked questions
What does second focal plane mean for the Argos HMR?
The reticle stays the same visual size as you zoom, so its subtensions for ranging or holdover are only accurate at maximum magnification, 20x here.
Is the Argos HMR waterproof?
Yes, it uses argon purging for waterproof and fogproof performance in the aluminum housing.
What magnification range does it cover?
4-20x through a 50mm objective lens.