Search  for anything...

Monstrum G3 3-18x50 First Focal Plane FFP Rifle Scope with Illuminated MOA Reticle and Parallax Adjustment

  • Based on 393 reviews
Condition: New
Checking for product changes
$249.95 Why this price?

Buy Now, Pay Later


As low as $41.66 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Saturday, Apr 12
Order within 9 hours and 51 minutes
Available payment plans shown during checkout

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


Item Weight: 3.66 Pounds


Material: 6061 Aircraft Grade Aluminum


Magnification Maximum: 18 x


Objective Lens Diameter: 5E+1 Millimeters


Magnification Minimum: 3 x


Compatible Devices: Rifle


Brand: ‎Monstrum


Color: ‎Flat Dark Earth


Style: ‎Heavy Duty


Sport: ‎Hunting


Item Weight: ‎3.66 Pounds


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


UPC: ‎850017827059


Item Package Dimensions L x W x H: ‎15.67 x 6.22 x 3.5 inches


Package Weight: ‎1.66 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: Saturday, Apr 12

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Well worth the money
Color: Flat Dark Earth
My monstrum fde scope delivered on time. The color matches my fde/black rifle setup. I highly recommend this scope if you're on a budget. It feels like high quality.
Reviewed in the United States on March 27, 2025 by Tyrone Smith

  • Great scope
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. ... show more
Reviewed in the United States on February 21, 2023 by Josh Freed

  • Better than expected
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. ... show more
Reviewed in the United States on September 11, 2024 by Glen

  • Great scope for the price
Color: Black
I liked the price of the scope for what you get. I think it will be great if it does what it says it will do. I haven't mounted it to my rifle yet. May be a while before I do so. A little more complicated than what I'm used to but I'll learn. Probably will use it for varmint hunting.
Reviewed in the United States on January 29, 2024 by Richard Thornton

  • Clear Sharp Image and ease of use
Color: Flat Dark Earth
This was recommended by a neighbor and I was very pleased with the ease of mounting and calibrating the scope and within 6 shots I was hitting steel at 450 yds.
Reviewed in the United States on January 18, 2025 by John A. Mcculley

  • Ok scope for the money
Color: Black
I've used a lot of Monstrum products over the years and this is a first. It's labeled as 1 lb 5 ounces. Scope, rings, and lens caps is actually 2 lbs 2.3 ounces. Retical is rather small at 3x but glass is clear. Rings that come with the scope are nothing spectacular but are rigid enough for a hunting rifle. Lens caps are a soft rubber that open and close nicely. Illuminated Retical does put a little glow in the glass when on the higher 3 settings. Is this a scope for extreme long rang shooting in my opinion no. But it's as good if not better than scopes out there that are 2-3 times the money. For 90% of the people out there this scope is more than enough for what you are doing and more capable than the shooters skills. ... show more
Reviewed in the United States on January 25, 2025 by DDUB

  • Works Very Good for the Money
Color: Flat Dark Earth
I got this scope with hopes of having some of the features on higher priced scopes without breaking the bank. Under the higher magnification it is not as clear or crisp an image, but it is still not bad considering the price point. All the high-end features work fine. I do like the fact I can feel the clicks when adjusting and even hear them quite well. I have had scopes you can't even feel the clicks on. I am satisfied enough that I did purchase another scope after this one with a little more magnification and like it as well. I have also purchased their rings in the same dark earth color to match the scope in a medium profile to get the scope a little closer to the barrel. Quite pleased with my purchase. ... show more
Reviewed in the United States on May 27, 2024 by Garry

  • Terrific Value for the Bucks
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!!!!! ... show more
Reviewed in the United States on November 22, 2020 by Dr. Wolf Rankis

Can't find a product?

Find it on Amazon first, then paste the link below.