Monstrum Guardian 3-9x Illuminated Rifle Scope
- Magnification Minimum: 3x
- Magnification Maximum: 9x
- Objective Lens Diameter: 40 mm
- Mounting Type: Weaver Mount
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B0B57PWJPHCategory: Rifle Scopes
More from this brandAll Monstrum rifle scopesOverview
A 3-9x magnification rifle scope with an illuminated MOA reticle, aircraft grade aluminum body and a nitrogen-purged sealed tube. Ships with Picatinny/Weaver rings and flip-up lens covers, positioned as a budget option for rifles and air guns out to moderate range.
Clarity and reticle definition come up as the recurring limitation, with more than one owner noting the crosshairs aren't as crisp as pricier scopes, while several report solid results zeroing it on rimfire rifles and air guns.
- 3-9x adjustable magnification
- Illuminated MOA reticle, red or green
- Nitrogen-purged sealed aluminum tube
- 1/4 MOA click windage and elevation adjustments
Who it's for
Owners of rimfire rifles, air guns or moderate-caliber rifles who want an affordable illuminated scope for target shooting or short-range hunting. Not for anyone who needs the reticle clarity or glass quality found in premium optics.
Pros and cons
- Affordable option for rimfire rifles and air guns
- Red or green illuminated reticle
- Includes mounting rings and flip-up lens covers
Specifications
| Brand | Monstrum |
|---|---|
| Dimensions & fit | |
| Objective Lens Diameter | 40 mm |
| Item Weight | 0.94 poundslower than 81% of 238 rifle scopes |
| Construction & materials | |
| Material Type | Aluminum |
| Color | Black |
| Compatibility & installation | |
| Mounting Type | Weaver Mount |
| Compatible Devices | Rifle |
| Other details | |
| Magnification Minimum | 3x |
| Magnification Maximum | 9x |
| Night vision | No |
| Sport Type | Hunting |
Closest rivals on specs
Frequently asked questions
Is the reticle illumination adjustable in color?
Yes, it offers a choice between red and green illumination.