Monstrum G3 3-18x50 FFP Rifle Scope
- Magnification Minimum: 3x
- Magnification Maximum: 18x
- Objective Lens Diameter: 50 mm
- Mounting Type: Picatinny Mount
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A first focal plane scope with accessories included that punches above its price, though the turret feel and top-end eye box are rougher than pricier optics.
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ASIN: B08KHYGSFRModel: G3 3-18x50Category: Rifle Scopes
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Overview
An FFP rifle scope covering 3-18x magnification with a 50mm objective, illuminated MOA reticle and parallax adjustment, aimed at mid to long range shooting out to 1000 plus yards. It ships with picatinny rings, a detachable sunshade and flip-up lens covers.
Because the reticle sits in the first focal plane, the MOA markings hold their proportion at any zoom level, so holdover estimates stay accurate whether you're at 3x or 18x. Buyers who've mounted it on rifles from a .220 Swift to an AR-15 report it holding zero across hundreds of rounds. One owner weighed the scope with rings and caps at over 2 lbs, more than the listed 1 lb 5 oz spec.
- 3-18x magnification, 50mm objective
- First focal plane illuminated MOA reticle
- Parallax adjustment dial
- Includes rings, sunshade and flip-up lens covers
Who it's for
Shooters who want an FFP scope with rings and accessories bundled in at a price well under premium glass. Less suited to anyone who wants precise, audible turret clicks or plans to shoot regularly at the very top of the zoom range.
Pros and cons
- Clear glass and clean tracking for the price
- Holds zero across multiple rifles and hundreds of rounds
- Reticle illumination stays visible even in daylight per one owner
- Turret clicks feel soft rather than crisp
- Eye box gets tight at the top of the magnification range
- Actual weight runs heavier than the listed spec
- No serial number engraved on the unit
Specifications
| Brand | Monstrum |
|---|---|
| Model | G3 3-18x50 |
| Dimensions & fit | |
| Objective Lens Diameter | 50 mmhigher than 69% of 309 rifle scopes |
| Construction & materials | |
| Material Type | Metal |
| Color | Black |
| Compatibility & installation | |
| Mounting Type | Picatinny Mount |
| Compatible Devices | Rifle |
| Included components | |
| Unit Count | 1 |
| Warranty & support | |
| Warranty Description | Lifetime |
| Other details | |
| Magnification Minimum | 3x |
| Magnification Maximum | 18x |
| Night vision | No |
| Product Style | Tactical |
| Thread Type | 30mm |
| Sport Type | Hunting |
Closest rivals on specs
Frequently asked questions
Does the reticle change size as I zoom?
No, it's first focal plane, so the MOA markings stay proportionally accurate at any magnification for range estimation.
What's included in the box?
The scope ships with a set of high-profile picatinny rings, a detachable sunshade and spring-loaded flip-up lens covers.
How heavy is it?
One buyer weighed the scope with rings and lens caps at just over 2 lbs, heavier than the 1 lb 5 oz spec listed for the scope alone.