Monstrum Ares V2 Open Reflex Dot Sight for Rifles and Long Guns | with Shake Awake Illumination
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Availability:
In Stock.
Arrives
Monday, Jun 1
Recently Viewed
Style: A1 Circle Cross Reticle
Color: Red Dot
Features
- Open reflex sight for rapid target acquisition of close range targets out to 100+ yards. Open reflex sights offer better peripheral vision and greater situational awareness than enclosed tube red dots.
- Offered in multiple different parallax free reticle configurations: A1 Circle Cross reticle, B1 Triangle Dot reticle, C1 Modified Crosshair reticle, and M2 multi-mode reticle with multiple selectable reticle options. Electronically controlled illumination with multiple levels of intensity up to daylight bright. Available in either red dot or green dot variants.
- The Ares comes with a custom optical system with minimal power draw and Shake Awake motion sensing technology. The dot will automatically shut off after one hour and re-activate instantly upon movement, providing tens of thousands of hours of battery life on a single battery, up to 10 times longer than LED powered dots.
- Integrated picatinny recoil lugs compatible with picatinny mounting platforms. For rifles and long guns. Not for use with pistols or handguns.
- All Monstrum products are backed by a lifetime guarantee.
Description
The Monstrum Ares is an open reflex sight for rapid target acquisition of close range targets out to 100+ yards. Open reflex sights offer better peripheral vision and greater situational awareness than enclosed tube red dots. Offered in multiple different parallax free reticle configurations: A1 Circle Cross reticle, B1 Triangle Dot reticle, C1 Modified Crosshair reticle, and M2 multi-mode reticles with multiple selectable reticle options. Electronically controlled illumination with multiple levels of intensity up to daylight bright. Available in either red dot or green dot variants. The Ares comes with a custom optical system with minimal power draw and Shake Awake motion sensing technology. The dot will automatically shut off after one hour and re-activate instantly upon movement, providing tens of thousands of hours of battery life on a single battery, up to 10 times longer than LED powered red dots. Rugged 6061 grade aluminum scope housing. Integrated picatinny recoil lugs compatible with picatinny mounting platforms, built to withstand both rifle and shotgun recoil. All Monstrum products are backed by a lifetime guarantee.
Item Package Dimensions L x W x H: 4.14 x 2.88 x 2.25 inches
Package Weight: 0.25 Kilograms
Brand Name: Monstrum
Color: Red Dot
Manufacturer: Monstrum
Part Number: RD215B2
Style: A1 Circle Cross Reticle
Date First Available: January 28, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Jun 1
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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Top Amazon Reviews
Style: M2 Multi-Mode Reticle
Color: Red Dot
I spent months agonizing over how much to spend and which brand and model. After an unreal amount of YouTube research and reading and comparing specs and channeling what’s probably my undiagnosed ADHD so hard, you’d think I was shopping for an organ. It’s full metal, minus the buttons which are rubber. The slating of the glass is pretty perfect. If there any tint, I can’t see it at all, even in full outdoor sun. The reticle is very clean. I discovered that I have astigmatism because if I look directly at the reticle it’s kind of slightly doubled but if you I use both eyes and look at your target, not the reticle, my astigmatism no longer messes with it and it’s crystal clear and laser sharp. I had someone who does not have astigmatism take a look and they described it as being crystal clear and perfectly sharp. Battery life is amazing. I’ve had the original batteries in there now, for about 6 months with probably the equivalent of 2 weeks worth of time and still going strong. The shake awake is flawless. The brightness of the reticle is really incredible for such an inexpensive optic. I went in the full screaming bright sun and started it as low as it goes to increase one click at a time, to see when it would be visible to a point of being usable. I was able to get it visible and easily functional 2 clicks from Max. At Max, it’s incredibly visible and remains crisp. This model does the classic Eotech style circle dot, just the dot or just the circle—no change in quality between settings. It’s really hard for me to imagine how the sight picture and reticle and glass could be better without spending a few hundred bucks. As for Zeroing, it works exactly as you want and expect it to work. It has very fine adjustments, was easy to dial in and in months of use, it hasn’t moved at all. Honestly, my only critique is I wish it had a Green mode. Then it would truly be perfect. Build Quality: 5/5 Glass: 5/5 Reticle quality: 5/5 Zero: 5/5 Brightness 5/5 Buttons: 5/5 Bang for the buck: 5/5 Material quality: 5/5 Battery life: 5/5 Support: I had emailed support asking if there was a flash kill or any sort of cover for this. My goal was to either use it to shield the glass from BB or modify the cover and install some Lexan into the cover so it held a shield in place. Unfortunately, there is not. I was able to cut and shape my own lens and devise a way to mount it. I will say also, anecdotally, the glass seems to be good quality in terms of strength. My shield got shot off at about 10ft with a .25g bb and the glass got a direct hit with 2 follow-up shots at 300fps. It didn’t crack, the glare coating didn’t scratch or otherwise. I’ve seen a LOT of optics in this price point and even some as high as 150, basically crack or straight up blow out. Needless to say, you should still use shields. It’s got a lifetime warranty so long as you don’t do don’t something stupid with it but unlike real firearms where if you get shot in the optic, you have WAY worse things to worry about than glass breaking, you do need to protect the glass. All in all, if you want an optic that’s gonna deliver as good of a quality performance as anything I’ve tried under 200$, this is an easy no brainer. Aesthetically, it looks nicer than the pictures, which already don’t look bad but once you feel it, it’s solid. It may not be the look some people want but other than that preference possibility, it could be 25$ more expensive and still be worth. I suspect this would hold zero pretty well on a decent selection of rifle calibers, without going too crazy and might even hold on a 20ga. I wish Monstrum had “pelican” style cases for this and a flash kill/shroud and it did Green as well as red but overall, you will not be disappointed at all. Everyone who sees it, asks to shoulder the rifle and give it a look or a try and they’re always very impressed and ask for the link. Best dot optic I’ve found under 100 and I would say even under 200, for its feature set and what it’s meant to do. I slapped it on the M4 using the adjustable height quickdrtach riser that Monstrum also sells. That is also a pristine purchase. Definitely look at that if you need a riser.
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Reviewed in the United States on September 18, 2025 by Lyman
Style: A1 Circle Cross Reticle
Color: Red Dot
For the price and quality, you cannot beat this scope. The sight remains accurate and is easy to use. It is also easy to sight in. The scope offers a nice field of view, making it easy to hit the bullseye every time. My friend liked it so much that I bought one for him. He is also able to hit the bullseye consistently using this sight.
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Reviewed in the United States on May 1, 2026 by Scott Gibson
Style: A1 Circle Cross Reticle
Color: Red Dot
Love the shake awake feature and it can also be turned on by the power button and it a automatically goes off after being still for a while so it won't be dead the next time you get it out of the safe if you forget to turn it off. It's very well built and can be easily mounted in 5 minutes. It's brightness levels can be seen in a low light setting really well without being too bright that it glares, and its bright enough to clearly view the reticle on the brightest sunny day too. It's pretty accurate too its handled probably close to 5-6 thousand rounds of 5.56 on my AR and still holding where it was when zeroed. The only bad thing I can say is if your trying to get perfect zero at 125 yards like hole through hole 1 click of adjustment and its slightly over corrected, but its a great reflex for the money otherwise. Top notch.
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Reviewed in the United States on October 27, 2025 by Shawn Chandler
Style: A1 Circle Cross Reticle
Color: Red Dot
Update, Seller responded extremely quick and sent replacement within 48 hours. It works beautifully. Just left the range. Was easy to zero in, seems to hold zero great. Very well made and sturdy. Red dot is nice and bright. Actually blew my expectations really. Can't beat it for the price honestly. Easy to install. Comes with all that you need. If you want a nice affordable red dot this is the one. Definitely going to be checking out some of the other monstrum products for sure. I wanted to like this red dot. Felt well constructed. Fit it nicely on my 9mm carbine. But every few shots it powers off. Changed the battery. Did not help. Just keeps shutting off. Not to mention i can't get it to hold zero when it is actually powered on. Im going to try one more time. Got a whole new battery. If that doesn't work I will send it back. No point in having it if it keeps randomly turning on and off every few shots. Update, Seller contacted me and has been super helpful and fast responses. Getting the broke one replaced. I will update after I check that.
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Reviewed in the United States on April 16, 2025 by Ricky m.
Style: M2 Multi-Mode Reticle
Color: Red Dot
This is really a difficult review to write, and also difficult to actually rate. I purchased this originally to mount on the diving board on one of my Monstrum Beast scopes, I have five Monstrum scopes and have been extremely pleased. After I mounted the red dot on the diving board it was impossible to zero. No big deal I then moved it to my PCC. Was able to zero it with out any issue, I really liked the large window and infinite eye relief. The motion awake function worked like a charm However when I turned on the weapon light the reticle disappeared, couldn't see anything even at the full brightness. Might as well use it as a paper weight. I then saw Monstrum had the Ares V2 in a green dot. Which I was willing to order and give it a try. Before I ordering the Ares in the green dot I submitted a question to Monstrum to find out if the Ares was compatible with the G3 Ghost magnifier. Yeah you guessed it no response. So even though I really like window on the Ares I think it's time to punt and look at some other available options CVLIFE, Sig Sauer, Holosub etc.
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Reviewed in the United States on January 23, 2026 by john morais
Style: M2 Multi-Mode Reticle
Color: Red Dot
Works great. Getting it to hold zero is some work, but after that it was fine.
Reviewed in the United States on May 16, 2026 by Mark Kriewaldt
Style: A1 Circle Cross Reticle
Color: Red Dot
I absolutely love the Monstrum Ares V2. The clarity is excellent, the construction is solid, and the overall performance far exceeds what you'd expect at this price point. It feels rugged and dependable, with smooth adjustments and crisp, repeatable turrets. The illuminated reticle is clean and easy to use in all lighting conditions, and the eye relief is generous enough to stay comfortable during extended shooting sessions. Zeroing it was simple, and it has held zero perfectly ever since. Honestly, this optic delivers the kind of quality and functionality you'd expect from a much more expensive scope. If you're looking for a reliable, durable, and feature-rich LPVO without breaking the bank, the Ares V2 is a fantastic choice. I couldn’t be happier with it.
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Reviewed in the United States on May 28, 2025 by JSAT
Style: A1 Circle Cross Reticle
Color: Green Dot
Put it on my Ruger 10/22 for steel challenge and fits picatinny rail well. I'm having issues with it going dark for a split second every time I pull the trigger and at one point it went really dim the back to bright between shots. Other than that seems to hold zero and the reticle is nice. Make sure to keep the emitter clean as that will cause some blurriness. Decent optic for the price.
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Reviewed in the United States on March 10, 2026 by david