Amazing optic! I bore sighted the sight to my barrel and when I say it’s on point, it’s on point! Very easy install and use. Highly recommend this optic.
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MERCURY™ Reflex Sight
✔️ Designed & Assembled in USA 🇺🇸
✔️ RMR Footprint
✔️ Motion Activated Dot
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Regular price
$249.95
Unit price
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MERCURY™ Reflex Sight - Black / 3 MOA Red Dot (Multi-reticle)
MERCURY™ Reflex Sight — RMR Footprint
Pistol Compatibility Checker
Check if your pistol mounts the MERCURY™ Reflex Sight direct, needs an adapter plate, or requires a slide cut.
Type make + model, or just the model name
⚠ Adapter plate required
Note: Many optics-ready pistols mount the sight using a manufacturer mounting plate — often the RMR plate included in the box with your firearm. Check your owner's manual or contact the manufacturer to confirm which plate your specific model requires.
Pistol not found in our database.
We may not have this model listed yet. If your slide has a factory RMR optics cut, MERCURY™ will mount directly. If not, a slide cut or aftermarket optics-ready slide is needed. Contact us for a definitive answer on your specific pistol.
We may not have this model listed yet. If your slide has a factory RMR optics cut, MERCURY™ will mount directly. If not, a slide cut or aftermarket optics-ready slide is needed. Contact us for a definitive answer on your specific pistol.
MERCURY™ Reflex Sight
Regular price
$249.95
Unit price
MERCURY™ Reflex Sight - Black / 3 MOA Red Dot (Multi-reticle)
The Mercury™ Reflex Sight is built for shooters who demand speed, precision, and modern design.
Mercury™ Tactical Red Dot Sight features motion activation, waking the optic when moved and powering down after 5 minutes of no movement. Combined with a top-loading CR2032 battery and up to 3 years of battery life, you get maximum uptime without removing the optic for battery swaps.
The RMR footprint ensures compatibility with a wide range of mounts and plates, while crisp 1 MOA adjustments let you zero quickly and precisely.
The Mercury™ Reflex Sight is proudly designed, assembled and tested in USA
With 4 selectable reticle options and 9 total brightness levels (8 daylight + 1 Night Vision), you get a sight that adapts instantly to every scenario.
Engineered with a rugged IP68 waterproof housing, Mercury™ Tactical Red Dot Sight performs in the harshest conditions—up to 3 M for 30 minutes.
Backed by Cosmic Tactical’s No-BS Limited Lifetime Warranty, Mercury™ is engineered to perform—every shot, every day.
Dimensions![]()
| Feature | Mercury™ Specs |
|---|---|
| Magnification | 1x |
| Objective Lens Size | 24 × 17.1 mm (0.945 × 0.7 in) |
| Reticle Options | 3 MOA dot, Cross, 60 MOA circle, combinations |
| Reticle Color | Red (LED) |
| Brightness Settings | 8 daylight + 1 night vision (NV) |
| Power Source | 1 CR2032 Lithium Battery |
| Battery Life | 3 yrs (usage dependent) |
| Adjustments | 1 MOA per click |
| Waterproof Rating | IP68 - 3 M (10 ft) 30 mins |
| Weight | 1.52 oz (43.3g) |
Designed, Assembled, and Tested in the USA 🇺🇸
Mercury™ brings a modern, minimalist design that outclasses traditional reflex sights. Assembled and tested in the USA for unmatched precision and reliability — built to lead, not follow.
Four Reticles. Unlimited Versatility.
Mercury’s multi-reticle system lets you choose a 3 MOA dot, crosshair, 60 MOA circle, or a hybrid. From rapid engagements to precision shots, Mercury™ offers versatility legacy brands can’t match.
IP68 Waterproof. Field-Ready. Life-Ready.
Built for real-world abuse — rain, mud, dust, and more. Mercury™ carries an IP68 rating, surviving 3 meters for 30 minutes without a hiccup. No babying required.
Always Ready. Never Wasteful.
Move and Mercury™ wakes up. Stop and it powers down. Its motion-activation system keeps you ready while saving battery when you’re not. Smart and efficient.
Mounts on Almost Anything.
Mercury™ uses the trusted RMR footprint, making it compatible with countless slides, mounts, and plates right out of the box. No proprietary headaches — just mount and go.
Swap Batteries Without Losing Zero.
No more removing your optic to change a battery. Mercury™ uses a top-loading CR2032 so you can swap power fast without losing zero. Simple, quick, real convenience.
Video Reviews
Frequently Asked Questions
Where is Mercury made?
Where is Mercury made?
Mercury™ is proudly designed in-house in Miami, Florida, where every detail of the optic’s look, performance, and functionality is engineered. Each unit is then assembled and tested in Texas, ensuring tight quality control and reliable performance before it reaches your hands.
Will the Mercury™ hold zero on high-recoil setups?
Will the Mercury™ hold zero on high-recoil setups?
Yes. Mercury™ is built with a rugged aluminum housing, precise 1 MOA adjustments, and shock-tested durability. We’ve tested Mercury™ on everything from standard pistol calibers like 9mm, .40 S&W, and .45 ACP, all the way up to 10mm Auto, 5.56/.223 platforms, .308, and even 3-inch 12-gauge slugs.
If your optic is mounted properly, Mercury™ holds zero — even under heavy recoil.
How long does the battery last?
How long does the battery last?
Up to 3 years, depending on brightness settings and motion activation usage. Mercury™ uses a top-loading CR2032 battery and is optimized to stay ready without draining power.
Is the Mercury™ waterproof?
Is the Mercury™ waterproof?
Yes — fully IP68 waterproof. Mercury™ is rated for submersion up to 3 meters for 30 minutes, meaning it handles rain, sweat, mud, and harsh conditions without any issues.
What guns is the Mercury™ compatible with?
What guns is the Mercury™ compatible with?
Mercury™ uses the widely adopted RMR footprint, making it compatible with a large range of pistols, mounts, and adapter plates. If your slide or mount accepts RMR patterns, Mercury™ fits.
Do I need to re-zero the optic when changing the battery?
Do I need to re-zero the optic when changing the battery?
No. Thanks to the top-loading battery design, you can replace the battery without removing the sight — which means no re-zeroing required.
What’s the return policy for the Mercury™ Reflex Sight?
What’s the return policy for the Mercury™ Reflex Sight?
We offer a 60-Day Money-Back Guarantee — no hassle, no drama.
If Mercury™ isn’t the perfect fit for your setup, send it back and we’ll take care of you. We stand behind our products, not behind loopholes.
What does the Limited Lifetime Warranty cover?
What does the Limited Lifetime Warranty cover?
Our No-BS Limited Lifetime Warranty covers:
• Optical system
• Mechanical housing
• Electronics for 5 years from the manufacture date
If something fails under normal use in those categories, we’ve got you.
What’s not covered under the warranty?
What’s not covered under the warranty?
The warranty doesn’t cover:
• Normal wear & tear
• Cosmetic damage (scratches, dents, etc.)
• Abuse, misuse, or unauthorized repair
Customer Reviews
Overall rating: 4.3 / 5 from 85 reviews.
I mounted the Mercury to my Springfield Echelon. This is the red dot that moves in, raids your fridge, and still pays rent on time. It bolted onto my Echelon as it came in the same box. It wakes up when you move the gun, then takes a power nap after 5 minutes so you don’t have to babysit batteries. This is basically the only roommate you trust with your carry gun. 5 Stars
Wow!!! I didn't spect this item to work well, just because it's my first time buying. Absolutely, I recommend it!!!
love it
I love the mercury, it just works, and works well. it definately has the best glass in this price point.
these are awesome. I have purchased 4 and will probably end up with a few more.
tjos is my second one. the first went on my wife's M&P, she loved it so much, that I got one for myself. I removed the mecanik sight and installed the mercury. I also have another one coming for my echelon.
Exactly what I thought it would be. Awesome! I also bought a holosun for comparison. I returned the holosun. It was almost half the price with more features. It’s also made in USA!
So far so good. Easy install on my M&P 10 2.0 and it looks awesome on the gun. My only complaint is that the green dot could be a little brighter but it would not keep me from buying another.
This is a solid optic for the price. It's crisp even in broad daylight. Easy to zero in. I did have an issue with the battery compartment lid upon arrival, but support sent me a replacement within days. My only serious problem is the thickness. I have optic-height sights that still can't see over the baseline. Not an issue as long as the optic is working, but something to keep in mind. That's the only thing keeping this from getting a perfect score.
at times when I look through my green dot mercury, I can see the reflection of the housing in the glass. My experience with red dots is only my holosun on my pistol, so maybe since this is mounted on top of my ACOG the reason I can see the housing is because of how close I am to the optic. Aside from that, glass seems good quality, I love the green dot over my red dot holosun, easy installation, easy Zeroing with acceptable tactile clicks, easy operation of reticle swaps, overall a good buy, I would buy again. my only complaint beside the reflection (which could be user error) is the flathead tool provided to adjust the zero turrets isn't as snug to the indent as I'd like. It works, but if they could make it slightly thicker to where there isn't any play in the turret indent when I'm trying to adjust it, that would be great. I love to support American made and small businesses when I think its a good product. I plan on buying the Saturn ACOG to compare to my Trijicon ACOG eventually and maybe the upcoming LPVO.
Fit is good Quality is good Multiple recital option is awesome Need to shoot it
Just got it installed on my LTT Beretta and it looks great.
Initial thoughts, the quality of it looks and feels great. It seems to be made very well, once I get some decent range time with it, I will have better feedback which may elevate it to the final star.
It is a good product with 4 different sight settings. Very visible. The only thing I dislike about it is it sits high to where I can’t use my iron sights unless I purchase suppressor height iron sights. I understand I could carry extra batteries but if I am in a situation I don’t have time to change the battery.
I’m having trouble finding an optic plate for the smith&wesson 2.0
Great purchase experience! Mercury punches with all the top brands and supports a homegrown company.
I really like my new sight; the fit and finish are excellent. My primary concern, however, is the power-up sequence. It takes a bit too long to wake up, and the button can be finicky to press correctly, which further delays getting the reticle on target. While I’m going to keep practicing with it, the lack of speed is concerning for high-pressure situations.
Awesome customer service nice product nothing to envy the Trijicon RMR HD will purchase again soon
I waited to respond because I had to have my Glock 34 milled so I could mount it. And I have to say I’m very impressed with every aspect, price point, clarity, reticle options etc.. it actually feels very similar to my Trij—-n HD except this one has reticle options and less than half the cost. I actually want to purchase two more for other guns.
I love that it’s assembled/made in the USA and it’s priced right. It seems to be well made overall. The dot visibility is as good as my Holosun. The finish flaked off a little around the mounting screw holes when I installed it (before any real torque was applied to the screws.) I installed it on my Ruger RXM. The RXM has tall sights but the sights base was so tall I couldn't see the sights at all. I don't require complete cowitness but I at least need to see the sights in the bottom of the glass. The allen screws that come with it are garbage and need to be replaced with some quality torx head screws. One of the screws rounded off pretty easily when I applied light torque to the screw with the supplied allen key. I decided to remove the sight and repurpose it for a pistol cal carbine on an RMR to picatinny riser or a Ruger .22 pistol that I don’t need to see the sights on. I ended up having to drill the screw headout to remove the sight because one of the rounded off screw. My opinion is, I have mixed feelings about it. Being that I cant see the sights on a gun with tall sights is a deal breaker for me and that breaks my heart because I wanted to love it. Over all, it is punching above its weight at the price, especially considering its assembled/made in the USA. It’s not bad, it’s not great, it’s just good.
The Mercury is a great optic. Clean, sleek look on the pistol and it mounted up in minutes with no hassle. The dot is crisp and very quick to pick up, which makes target acquisition fast. After running it a bit, it feels solid and holds zero well. Definitely a good option if you’re looking for a reliable reflex sight without spending a fortune.
The Mercury really sets off the look combined with the Saturn optic! Can't wait to try it out very soon. A small design flaw. Used my bore sight to make sure they were dialed in together. The up/down wind adjustment cap on the Saturn cannot be removed with the Mercury sight installed on the RMS plate. Happy to send a picture or video to show.
Looks great does what it needs to do
Seems like a quality optic so far. Had to get an adapter plate to mount it to my new pistol. That's my fault, I didn't realize at the time of ordering what RMR base meant. I'm not sure what percent of customers would want to have an RMR vs. a rail mount optic. Either way I'm happy to try out and support a made in America product.
I like this so far and feel it's worth the money for what I hope to always be a reliable reflex sight. The motion activation was probably my first most desired option and the Multi-Reticle System was practically equal to first. Weather resistance and a top change battery are non-negotiable.
Did not fit the footprint with the canik mounting plate installed. Just a touch too long to fully seat, but installed directly and fits in snug and secure.
It arrived in a sturdy plastic box, with the sight well protected in foam, with the accessories beneath it. The well made adjustment tool works well with both the battery cap and the windage and elevation adjustments. The brightness settings have enough range that it should work in any lighting situation. The reticles are clear and sharp to my no longer young eyes. Glass clarity is difficult to distinguish from Trijicon and Aimpoint optics that I have. It is definitely better than the Sig Romeo Pro, which is in a similar price range. I haven’t yet had the chance to put the Mercury to hard use yet, but the first impression is really good. I will definitely be considering another Mercury for my future pistol optic needs.
I would by this red dot again and recommend it. Battery access, multiple reticles, weight/feel. All just fine. My only gripe... to all red dot makers, can you all just agree to make the power on/off the (+) button for 3 seconds? I fumble for minutes each time i pick a different RD up.
Works as described
Great sight for full sized handgun feels like good quality sight
Great sight! Will definitely buy more!
This is a warranty replacement. We will see how this one holds up. I have two on rifles and they work great. Riding the slide of a 1911 is one tough mission!
I havent have the opportunity to practice with it. But if i had no problems with it, I'll continuing doing business with you.
It’s my second Mercury!
Wish I could give it 5 Stars. It gets 4/5 - it is clear, it mounts easily, has the battery in a place you can change without removing the optic, the reticals are good and I like the options, it looks durable, it was easy to sight in, however - and this is the reason it loses a whole star - the functional sight window is small, like ccw or RMSc small (think Osight's ccw SE series small). I wish I knew how small this sight window was when ordering - and it's because the body is the tallest I have ever seen on any optic I own (I have over a dozen), while the front glass is comparable to a vortex ST, the back body eclipses the bottom 1/3 of it from your view. I would not order again because of this.
Top Tier Quality and Packaging! I forsee this Cosmic Tactical Mercury Reflex Sight going on my firearms for the foreseeable future. Outstanding!
Had an issue with the first red dpt i ordered and they were nothing but helpful and they sent me a new one in a very short time will be buying more!
Fast shipping and even better product !!
Its not a “direct mount” like it’s advertised wouldnt fit on my beretta apx a1 carry neither on the apx a1 compact
