Monstrum G3 3-18x50 First Focal Plane FFP Rifle Scope with Illuminated MOA Reticle and Parallax Adjustment
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FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
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Availability:
In Stock.
Arrives
Friday, Dec 19
Color: Flat Dark Earth
Features
- High performance tactical rifle scope with 3-18x magnification for mid to long distance shooting out to 1000+ yards
- Functionally designed first focal plane MOA reticle, with easy-to-read ranging information that remains constant regardless of magnification, for faster range estimation and holdover correction
- Equipped with a parallax adjustment dial that allows for sharper focus of the target image, elimination of parallax, and range estimation
- Inline dial controlled reticle illumination with multiple brightness intensities, for better reticle visibility in low light environments
- Package also includes set of high profile picatinny scope rings, a detachable sunshade, a set of spring loaded flip-up lens covers
Brand: Monstrum
Color: Flat Dark Earth
Style: Heavy Duty
Sport: Hunting
Material: 6061 Aircraft Grade Aluminum
Magnification Maximum: 18 x
Objective Lens Diameter: 5E+1 Millimeters
Magnification Minimum: 3 x
Compatible Devices: Rifle
Mounting Type: Picatinny Mount
Brand: Monstrum
Color: Flat Dark Earth
Style: Heavy Duty
Sport: Hunting
Material: 6061 Aircraft Grade Aluminum
Magnification Maximum: 18 x
Objective Lens Diameter: 5E+1 Millimeters
Magnification Minimum: 3 x
Compatible Devices: Rifle
Mounting Type: Picatinny Mount
Night vision: No
Model Name: G3F31850
Manufacturer: Monstrum
Reticle Type: Type-H
UPC: 850017827059
Item Package Dimensions L x W x H: 15.59 x 6.06 x 3.54 inches
Package Weight: 1.65 Kilograms
Brand Name: Monstrum
Warranty Description: Full Lifetime Warranty
Part Number: G3F31850-FDE
Included Components: G3 3-18x50 FFP Scope, 30mm High Profile Scope Rings, Lens Cleaning Cloth, Spring Loaded Flip-up Lens Covers, Sunshade
Date First Available: October 2, 2020
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Dec 19
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Color: Flat Dark Earth
I recently purchased the Monstrum G3 3-18x50 First Focal Plane FFP Rifle Scope with Illuminated MOA Reticle for my range sessions, and it’s been a fantastic addition to my setup. This scope is designed for precision shooting, and it’s delivered impressive clarity and functionality for my needs. Quality and Build: The Monstrum G3 feels solid right out of the box. The 50mm objective lens is housed in a durable aluminum body that’s both lightweight and rugged. The turrets are crisp and tactile, with audible clicks for adjustments, and the illuminated MOA reticle is a nice touch for low-light conditions. It comes with lens covers, which are a thoughtful addition for protection during transport. Performance: This scope performs beautifully at the range. The 3-18x magnification range is versatile, letting me zoom in for long-distance shots while still being usable at closer ranges. The first focal plane reticle scales perfectly with the magnification, making holdovers and adjustments intuitive. The glass is clear, with minimal distortion even at higher magnifications, and the illuminated reticle (with multiple brightness settings) helps in dim conditions. I’ve had no issues with zero retention after several rounds. Value for Money: For the price, this scope is a steal. It offers features you’d expect from higher-end models—like a first focal plane reticle and illuminated MOA—at a fraction of the cost. If you’re a shooter looking for a reliable scope without breaking the bank, this is a budget-friendly option that punches above its weight. Minor Notes: The eye relief is decent but can be a bit tight at higher magnifications, so adjust your position carefully. It’s a bit on the heavier side (as expected for a 50mm scope), so make sure your rifle setup can handle the weight. Also, while it’s rated for various calibers, double-check your mounting setup for compatibility. Overall: The Monstrum G3 3-18x50 FFP Rifle Scope is a reliable, high-value choice for range shooting. It’s clear, versatile, and packed with features that make it a joy to use, all at an affordable price. I’m thrilled with its performance—5 stars for quality and functionality!
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Reviewed in the United States on April 3, 2025 by ess2thebee
Color: Black
I purchased this scope to give it a try. The price was too hard to pass up for a ffp scope with brass internals and all the other features. I was surprised with the clarity of the optic, it tracks very well, holds zero, and the reticle is easy to see at all magnification levels. I did notice that when you get to the top of the magnification level, the eye box can be a little finicky. It can be a bit harder to get the right angle to see through to get the sight picture. You just have to take your time and get lined up behind the scope. I’ve seen other people complain about the center dot when at top magnification. At top magnification, the center dot will match a one inch circle on the target at 100 yards. This scope is on a hunting rifle, so this doesn’t bother me. I also had no issues taking shots out at further distances than 100 yards. I think this scope is a good value. I’m happy I purchased it. It will serve its purpose perfectly for me.
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Reviewed in the United States on February 21, 2023 by Josh Freed
Color: Black
nice scope but the center dot is way too big for precise work. it covers about 2 inches at 100 yards. other than that i like it.
Reviewed in the United States on September 21, 2025 by Leon A Moon
Color: Black
Its every bit as good as my Vortex PST, for nearly three times less what I paid for the Vortex. It is mounted, but not yet sighted in. I love the FFP Reticle. The only thing I found strange, was the lack of a serial number on the device. If it got ripped off some how, how would I ever prove it was mine without having damaged it by engraving, etc. The bottom line is its a damn fine scope for the money, Plus I got another 30% off when I bought it with "an Amazon store card offer." I ended up getting it for about $165.00. I'm still doing my "happy Dance." So I lost a screw that affixes the scope to the rings. I "heard" it drop to the box below, never, of course to be found again. I contacted Monstrum to ask if I could purchase a couple, and they said "no problem" and sent me 4 new ones and called it a warranty. MAN, I love these people and their scopes!!!!!! This is an excellent scopeat twice its price. I'm going to shop them first for the next optics I buy. I had really believed that "the good old days" were gone, but not at Monstrum. Mind you, I'm not gushing over a screw!, I am gusing over their customer service which is EXCEPTIONAL!!!!!
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Reviewed in the United States on November 22, 2020 by Dr. Wolf Rankis
Color: Flat Dark Earth
I have two 6-24 G2 and G3 scopes and I really like them, but they add significant weight to the rifle for hunting applications. I am not a competition shooter. So hunting applications are more important to me. the 18x on this scope is more than enough for any ethical shooting distance on game. I prefer shooting on 6-9x, but am glad to have the extra boost if needed. The clarity on the scope is far better than I expected. Excellent. The focus is excellent. The parallax adjusts easily and with excellent focus for my eyes. The windage and elevation are easy to use and adjust with excellent feel and audible clicks. The dial can be adjusted to zero. There is no zero stop, but once sighted the dial can be set at zero. I prefer this for hunting applications. The only negative I have on this scope is that the illumination for the reticle is extremely hard to adjust. But, I won't use it very often, so I can live with it. Overall, this scope meets everything I want in a scope for a hunting application. I highly recommend it. I wish I had found this before I bought the 6-24x scopes. For hunting, I like this much better.
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Reviewed in the United States on September 11, 2024 by Glen