Monstrum P330-B Marksman 3X Prism Scope
- Magnification Minimum: 3x
- Magnification Maximum: 3x
- Objective Lens Diameter: 30 mm
- Mounting Type: Picatinny Mount
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A strong value pick for AR shooters wanting clear glass and an illuminated reticle at 3x, though check eye relief carefully if mounting on an AK or similar side-rail setup.
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ASIN: B0BW7MYSBNModel: P330-B MarksmanCategory: Rifle Scopes
More from this brandAll Monstrum rifle scopesOverview
A fixed 3x magnification prism rifle scope (model P330B-DX1) with a 30mm objective lens, illuminated red and green reticle, and single-piece machined aluminum body weighing 17 ounces, rated for targets out to 300 yards.
As a prism scope it uses a glass prism system instead of the refracting lenses in a traditional scope, which lets Monstrum fit 3x magnification into a smaller housing than a comparable variable scope.
- 3x fixed magnification, 30mm objective lens
- Reticle etched into glass, works with illumination off
- Single-piece machined aluminum body, 17 ounces
- Lifetime warranty from Monstrum
Who it's for
Suits AR-platform shooters wanting an affordable step up from a red dot with fixed magnification out to a few hundred yards.
Pros and cons
- Reticle etched into glass, usable without illumination
- Reported to hold zero after extended use
- Red and green illumination with adjustable brightness
- Eye relief too short for some AK-pattern mounts
- Bolts reported to loosen after firing without thread locker
- Heavier than expected for its size
Specifications
| Brand | Monstrum |
|---|---|
| Model | P330-B Marksman |
| Dimensions & fit | |
| Objective Lens Diameter | 30 mmlower than 75% of 309 rifle scopes |
| Item Weight | 1.06 poundslower than 66% of 238 rifle scopes |
| Construction & materials | |
| Material Type | Aluminum,Glass |
| Color | Black |
| Compatibility & installation | |
| Mounting Type | Picatinny Mount |
| Compatible Devices | Rifle |
| Other details | |
| Magnification Minimum | 3x |
| Magnification Maximum | 3x |
| Night vision | No |
| Product Style | DX1 Reticle |
| Sport Type | Hunting |
| Reticle Type | Circle Dot |
| Field Of View | 39.3 feet |
Closest rivals on specs
Frequently asked questions
Does the reticle work if the battery dies?
Yes, the reticle is etched into the glass, so it remains visible without illumination, per both the listing and reviewer feedback.