Search  for anything...
Monstrum

Monstrum 1-4x20 Rifle Scope with Rangefinder Reticle and Medium Profile Scope Rings

    • Based on 1,160 reviews
Condition: New
Checking for product changes
$69.95 Why this price?
Save $30.00 was $99.95

Buy Now, Pay Later

As low as $11.66 / 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, 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: 16 left in stock
Fulfilled by Amazon
Arrives Monday, May 20
Order within 14 hours and 6 minutes
Available payment plans shown during checkout

Recently Viewed

Color: Black


Features

  • Tactical rifle scope providing crystal clear targeting at 1-4x magnification, with a 20mm objective diameter and an eye relief of 3.5-3.8 Inches
  • Glass rangefinder reticle for on-the-fly range estimation and long distance targeting
  • Lever controlled reticle illumination in both red and green with multiple brightness intensities
  • Includes set of 1 inch high profile scope rings
  • Aircraft grade aluminum construction with a 1 inch sealed, nitrogen charged tube for resistance to water and fog

Brand: Monstrum


Color: Black


Style: Tactical


Sport: Hunting


Item Weight: 11 Ounces


Material: 6061 Aircraft Grade Aluminum


Magnification Maximum: 4 x


Objective Lens Diameter: 20 Millimeters


Magnification Minimum: 1 x


Compatible Devices: Rifle


Brand: ‎Monstrum


Color: ‎Black


Style: ‎Tactical


Sport: ‎Hunting


Item Weight: ‎11 Ounces


Material: ‎6061 Aircraft Grade Aluminum


Magnification Maximum: ‎4 x


Objective Lens Diameter: ‎20 Millimeters


Magnification Minimum: ‎1 x


Compatible Devices: ‎Rifle


Mounting Type: ‎Picatinny Mount


Night vision: ‎No


Eye Relief: ‎3.5 Inches


Item Package Dimensions L x W x H: ‎12.68 x 4.33 x 3.11 inches


Package Weight: ‎0.63 Kilograms


Brand Name: ‎Monstrum


Manufacturer: ‎Monstrum


Part Number: ‎S1420-R-RG


Included Components: ‎1-4x20 SFP LPVO Scope, 1 inch Medium Profile Scope Rings, 1x CR2032A Battery, Lens Cleaning Cloth, Manual


Date First Available: May 20, 2013


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, May 20

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
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • with this feature set and robust built quality you're not going to do better for a sub $100 scope
Color: Flat Dark Earth
honestly, with this feature set and robust built quality you're not going to do better for a sub $100 scope, you're just not, the glass is clear and fairly bright, eye relief is optimal, and the thing just has a great build quality, it's a bit on the heavy side due to this, but what do you expect? it's can;t be well built, lightweight and affordable, such a beast does not and simply cannot exist, quality lightweight materials cost money, sure you can buy a cheap light weight scope but one slip or fall and that piece of garbage is likely toast....seeing as how you couldn't hit the broadside of a barn even with this scope, you could club a man to death over the head with it and it'd still likely be functional and holding zero. i'm a big fan of PA and vortex, a vast majority of my rifles have stuff from those guys on them, i bought this one because it was one of the few scopes that came in FDE and needed something cheap to go on a range toy AR-47 that i put together, turns out this thing is pretty darn nice and is sitting on my scar17 for the moment until i can get the money together for a razor HD or Acog, but in the meantime this seems to have held up to the recoil well and looks at home there, just to be clear, this is not a $1,000 scope, don't expect it to perform as such, in the price range that this scope competes with though is is top notch, you're only chance to do better would be a going with a non-illuminated, BDC reticled, fixed power scope of sorts...and that doesn't sound like much fun! as i've said, this thing has a great feature set and is well built, i expect it to out last any of the other, now flimsy feeling, weaver type scopes i'm currently using and will probably come back and buy another couple of these for rifles where it makes sense for a 1-4 scope. i should also say that dials and adjustment all fell super solid as well, everything on this scope is just solid. the integrated throw lever is a nice touch as well. nobody has given me anything of any sorts to say any of this,....bummer, lol, i still wonder how all of these people get free stuff all of the time, ....probably because my reviews suck. lol ... show more
Reviewed in the United States on April 23, 2017 by THEIZZARDKING
    • The 1 inch winner
Color: Black
My second Monstrum, and I don't regret this one. Granted, you can get PrimaryArms for same price (when on sale) but my big thing is, 1" tube diameter. Go ahead and look see how many LPVO's you can find with 1" tube... The glass is OK clear, nothing came loose after shaking it like a maniac for 5 minutes, but didn't do a drop test... yet. The diopter adjustment is ok, even thgouh you might have a tough time if you're in the + side with your vision. Has a mini throw aluminum lever which I loctite'd (new word) - makes the zoom wheel turning fairly easy. On the left side, this proof that proof message in white letters is clearly visible when you mount the scope, so that's a little cheap looking, maybe I'll cover it with a sticker. Also, comes with this weird battery (two of them) - not your standard 2032 or 2025. Has orange "glass" bikini lense cover, which is a'right - keeps things from getting overly dusty. The reticle, not my super fav, but illuminates abundantly in both red and green - 5 settings each with no 0 stops between levels with the knob set on the left at 45 degree angle, close to the eye viewer. Turning was ok - not too hard, however the battery door gasket will bunch up on you if you tighten it fast and furious, so three finger it, Mercedes logo style, slowly. Windage and elevation turrets are small to medium height, and very nicely clikety and tactile, even though they don't snap on a setting like a swiss clock - so it's a bit mushy. And scope rings are included - medium size. Bottom line, a head turner it is not. But, it doesn't need to be. Hopefully, gets the job done, after going on a 44mag lever with full loads, not Special. That'll really bang it around good, hoping it'll come out alright and keep on ticking. ... show more
Reviewed in the United States on December 30, 2022 by C. Andrea
    • MONSTRUM GETS PROPS
Color: Black
My expectations werent very high for this optic, however i am mildly impressed with what i recieved. I recieved this on saturday and sighted in on sunday. So let me start with the pros Pros 1) very well made housing. Made from aircraft grade aluminum. 2)glass is much clearer than expected from such a low budget scope. Comparable to primary arms and vortex. 3) reticles are thin enough to take distance shots up to 500 yards without blocking the veiw of target center. Yet not so thin they disappear when looking through the eyepeice for extended periods of time. 4) is definitely water resistant to heavy downpour. Was sighting in in a heavy rain and used the red illumination during it. 5) most important pro- so far after zeroing, holds zero after an additional 200 rounds. Center mass(or windage) has not changed as well as elevation. With ammo that is way to light for my ar15, i was getting 1 1/2 groups at 100yrds. That was with 64 grain fmj. With 68 grain handloads i know it will tighten up to less than 1/2 inch at 100 And no. That is not a typo. 6) eye relief is spot on. Easy target aquisition. 7)last but not least. The windage and elevation turrets are top notch. Are resetable after zeroing and are crisp and audible when adjusting. No spongy feeling between clicks. Ok so cons. Not a long list surprisingly. 1) illumination is non existant during the day even at the highest setting but overpowering in low lightconditions. In low light i found level 2 the only acceptable level as anything higher creates glare inside the optic right at the eyepeice. That being said, 2 is a good setting wether its green or red. 2) make sure your turret caps are on after adjustments are done. The caps are the only thing to ensure the scope maintains being fully waterproofed. 3)paralax is very noticeable on lower power. Final thoughts Overall i am impressed at the clarity and accuracy of this LPVO. It definitely helped my rifle go on a diet and lose over a pound over my old scope. While paralax effect is there it hasnt hindered my ability to use this scope with great accuracy. Alows for quick recovery and great eye relief. I also bought medium rise rings after reading some of the reviews regarding use on the AR platform. They were right. Invest in some medium or tall risers for this optic and you wont feel you wasted your money. I would definitely recommend this to anyone and even at a budget price it delivers amazing performance. ... show more
Reviewed in the United States on July 15, 2020 by Aaron Wunder
    • Clear, smooth
Color: Black
Scope is clear, the magnification is perfect for short to med distances, basically is a red dot with a magnifier but with out the weight, the throw peg and dial are smooth
Reviewed in the United States on March 27, 2024 by Hunter LaRouche

Can't find a product?

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