6 Best Red Dot For Sig Sauer MPX

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I’ve spent countless hours at the range with this exceptional firearm and tested various red dot sights under different conditions. 

Through this process, I’ve found that the Holosun 510C stands head and shoulders above the rest. 

My aim is to give you a guide so you can make an informed choice for your SIG Sauer MPX. Stick around, and you’ll find out exactly why the Holosun 510C became my go-to red dot sight.

This article aims to provide an in-depth, first-hand review of the best red dot sights for the SIG Sauer MPX. We’ll explore different options, from budget to high-end, but I’ll particularly focus on why the Holosun 510C has consistently outperformed others in my tests.

Top 6 Best Optics For SIG Sauer MPX

Red dot sights are by far one of the best additions you can make to your sig mpx if accuracy and precision are two things that interest you.

Let’s look at some of the best sig mpx sights currently available on today’s market for Sig MPX owners. We’ll also share our recommendations depending upon your specific shooting needs.

ProductKey FeaturesRating
HOLOSUN – HS510CSolar failsafe feature
It is user-friendly
Holds the recoil nicely
Allows you to shoot accurately
Holosun 507CLong-lasting battery
Shake awake
Robust 7075 aluminum
Waterproof up to 1 meter
Diverse reticle options (2 MOA, 32 MOA).
Day and night vision .
Parallax-free design
Sauer Romeo 5 2 MOA Red-Dot
Waterproof and fog proof
It is user-friendly
Holds the recoil
Sig Sauer
2 MOA red dot
Extremely durable
IPX-7 Waterproof
Vortex Optics SPARC2 MOA dot
Pin-point accuracy 
700 to 50,000 hours battery time
Anti-reflective coatings
Highly durable
12 illumination settings
Water, fog, shockproof
Vortex Optics
Strike fireII
Reliable scope
10 brightness settings

1. HOLOSUN – HS510C – Best Red Dot for Sig Mpx


Brand: HOLOSUN Color: Black Style: 2 MOA Dot, 65 MOA Circle Item Dimensions LxWxH: 4.75 x 3.62 x 3.12 inches Weight: 8.3Ounces Material: Aluminum Objective Lens: 30 Millimeters Night vision: No

The HOLOSUN HS510C is a red dot sight designed specifically for long-barrel guns like the SIG Sauer MPX. Built with aluminum alloy housing, it’s both durable and lightweight. 

The sight features a multiple reticle system, giving you the option to toggle between a 2 MOA dot and a 65 MOA open circle. 

Plus, with its Solar Failsafe system, the sight boasts an impressive battery life of up to 50,000 hours.

Why to Buy: Alright, why should you go for this bad boy? First, the sight is super user-friendly. Whether you’re a seasoned shooter or a beginner, you’ll find it easy to operate. 

The Solar Failsafe system ensures that you won’t be left in a lurch during an important moment. The sight is parallax-free with unlimited eye relief, allowing for rapid target acquisition. 

Additionally, it can easily be mounted onto any firearm with a Picatinny rail, not just your SIG Sauer MPX.

Why Not to Buy: Now, let’s talk about the drawbacks. One hiccup you might encounter is that the red dot’s brightness settings aren’t always as responsive as you’d like. 

In certain lighting conditions, the sight may not adjust quickly enough to your liking, which could be a big deal in a high-pressure situation. 

Also, while the sight is robust, it’s not night-vision compatible. If night operations are crucial for you, this might not be your best bet.

Who Should Buy: So, who is this sight for? If you’re someone who enjoys shooting in a variety of environmental conditions, this is for you. 

The Solar Failsafe system and long battery life make it a reliable option. Its user-friendly design and affordability make it an excellent choice for both new and experienced shooters. 

Especially if you own a SIG Sauer MPX, you’ll find this sight to be a tailor-made companion for your firearm.

My Testing

I’ve used the HOLOSUN HS510C on my SIG Sauer MPX for a while now, and let me tell you, it’s a game-changer. Its wide field of view and multiple reticle options make acquiring targets a cinch. 

The sight performed remarkably well under the harsh sun or low light. It’s become an essential part of my shooting setup.


  • Works well even in low-light conditions without relying on a battery.
  • Solar energy capability saves battery life.
  • Highly user-friendly and easy to mount.
  • Excellent recoil management.
  • Accurate shooting or hunting.
  • Cost-effective.
  • Auto-brightness settings adapt to various conditions.


  • The red dot brightness doesn’t always adjust to your preference.

2. Holosun 507C – Second Best

The Holosun 507c packs a punch with its robust 7075 aluminum housing and multi-coated glass lens. It is designed to be your reliable partner, has a multi-reticle system featuring a 2 MOA dot and a 32 MOA circle. 

It’s IPX-6 waterproof and has an impressive battery life of up to 100,000 hours. Shake awake and solar failsafe features ensure you’re always ready to take your shot.

Why to Buy: First, the durability here is top-notch; the 7075 aluminum is sturdy. Long battery life? Oh yeah, it’s got that too. 

You’ll hardly find yourself in a pinch looking for batteries. Plus, the shake awake feature is like a magic trick—stop moving, and it sleeps; move a little, and it’s wide awake. 

The solar failsafe is a lifesaver; you’re never really out of juice. Perfect for spontaneous shooting trips!

Why Not to Buy: Alright, it’s time to get real. One downside is the bluish tint that some users have noted. It can be a smidge of distracting when you’re focusing. 

Another thing—though it’s got 10 daylight brightness settings and 2 for night vision, some folks wish for more versatility. 

Lastly, the sight has no lock mode to secure your preferred settings, so you might need to readjust more often than you’d like.

Who Should Buy: Looking for reliability and ease of use? This sight’s for you. Whether you’re into tactical shooting or you’re a hunter on the prowl, the 507c won’t let you down. 

The reticle options cater to speed and accuracy, making it versatile. And if you already have a 

SIG Sauer MPX, mounting is a walk in the park. All in all, it’s a solid all-rounder.

My Testing 

I’ve slapped the Holosun 507c on my SIG Sauer MPX; let me tell you, it’s like the cherry on top. 

The sight is as sturdy as they come, and switching between the dot and circle is smooth sailing. Battery life? Didn’t even have to think about it. It felt like the sight, and my MPX were made for each other.


  • Long-lasting battery (50,000 to 100,000 hours)
  • Shake awake, and Solar failsafe features keep you on your toes.
  • Robust 7075 aluminum housing that can take a beating.
  • Waterproof up to 1 meter for 30 minutes.
  • Diverse reticle options (2 MOA, 32 MOA).
  • Day and night vision brightness settings.
  • Parallax-free design.


  • The bluish tint on the lens can be a tad distracting.
  • Lack of lock mode for preferred settings.

3. SIG Romeo 5 – Customers Choice


Brand: Sig Sauer Color: Black Dimensions LxWxH: 7.75 x 4.75 x 3.5 inches Weight: 1.1 Pounds Material: Metal Objective Lens : 30 mm Magnification Max: 1x Objective Lens: 20 mm Magnification Minimum: 1x

The Sig Sauer Romeo 5 is a compact 1x20mm red dot sight that comes with a 2 MOA dot. It features Motion Activated Illumination, which is pretty cool for saving battery. 

The sight is IPX-7 waterproof and also comes with a versatile Picatinny mount. Weighing in at just 1.1 pounds, it’s lightweight but feels solid.

Why to Buy: Look, you’re getting a compact sight with 10 illumination settings. It’s versatile and works great in all lighting conditions. 

Plus, the Motion Activated Illumination means your battery will last longer. It runs on a single CR2032 battery that’ll give you up to 40,000 hours.

That’s a lot of bang for your buck! And it’s so user-friendly you can attach or detach it in a snap.

Why Not to Buy: Alright, let’s be honest here. The mount is a bit on the delicate side. So, you must be super careful when mounting this thing because the plastic can break. 

That’s one downside you should keep in mind. Also, it might not have some of the advanced features that the higher-end models offer, so it could be limiting for pros looking for a little extra.

Who Should Buy: If you’re new to red dot sights or you want quality without burning a hole in your pocket, this one’s for you. 

Also, if you’re going to be moving a lot, the Motion Activated Illumination is a neat feature that’ll save battery life. Even seasoned shooters who want a reliable, straightforward sight for their 

SIG Sauer MPX should seriously consider this.

My Testing

Let me tell you, it felt like a natural extension of my MPX. The sight held up well during rapid fire, and I didn’t lose focus even once. 

The 2 MOA dot was crystal clear, and adjustments were straightforward. It was just plug-and-play for me.


  • Easy elevation and windage adjustments
  • Lightweight and portable
  • Waterproof and fog-proof
  • Crystal clear lens
  • Super quick target focus
  • Long battery life


  • Delicate mount plastic

4. SIG Romeo 4S – User Friendly


Brand: Sig Sauer Color: Black Dimensions LxWxH: 4.72 x 3.03 x 0.76 inches Sport Type: Hunting, Airsoft, Tactical & Military Weight: 0.15 kg Magnification Maximum:1 x Objective Lens : 20mm Magnification Minimum1 x

Sig Sauer Romeo4S is a red dot sight that’s small but mighty. Weighing only 0.15 kg, it’s solar-powered and comes with an astonishing 100,000-hour battery life. 

Designed for modern semi-autos and shotguns, it features a 2 MOA Red Dot Ballistic Circle Dot reticle. Its CNC aluminum housing is robust, IPX-7-rated, waterproof, and fog-proof.

Why to Buy: Listen up! This sight isn’t your run-of-the-mill optic. It’s solar-powered, which translates to long-term sustainability and an outstanding 100,000-hour battery life. 

The Romeo4S is designed explicitly for semi-automatics, making it a great fit for the SIG Sauer MPX. The 2 MOA red dot perfectly balances size and visibility, allowing for precise shots without taking up too much of your field of view.

Why Not to Buy: While the Romeo4S boasts many benefits, it’s not without its downsides. For one, it’s a bit on the heavy side. You might notice the weight when you’re going for that perfect aim. 

Also, it’s not the cheapest option out there, so if you’re on a budget, you might want to explore other options. While the sight is packed with features, it’s not for everyone’s pocket or preferences.

Who Should Buy: If you won’t compromise on quality and are willing to invest in a top-notch sight, this is for you. It’s perfect for owners of the SIG Sauer MPX. 

The solar panel and extended battery life make it an excellent choice for those who spend a lot of time outdoors, whether you’re on a hunting expedition or just plinking targets for fun.

My Testing 

Putting the Romeo4S on my SIG Sauer MPX was an experience in itself. It’s like they were made for each other. 

The red dot was vivid, the solar feature was brilliant, and the build quality impressed me. While it added some weight, the trade-off in features was worth it.


  • Solar-powered, eco-friendly
  • Exceptional battery life of 100,000 hours
  • Designed for semi-automatic firearms
  • 2 MOA red dot allows precision
  • IPX-7 waterproof and fog-proof


  • Weight might be noticeable
  • Pricier than other models

5. Vortex Optic SPARC – Great Value


Brand: Vortex Color: BLACK Style: Gen II  Dimensions LxWxH: 5.6 x 4.65 x 2.7 inches Sport Type: Hunting Weight: 0.8 Pounds Material: Aluminum Magnification Maximum: 1 x Objective Lens: 44 Millimeters Magnification Minimum: 1 x

Vortex Optics SPARC Gen II is a compact red dot sight designed for rapid combat. Weighing just 0.8 pounds and made from durable aluminum, it has a battery life of up to 700 hours at its highest setting.

The scope has 12 illumination settings anti-reflective coatings, and is night vision compatible.

The O-ring seals make it resistant to dust and moisture.

Why to Buy: Okay, here’s the deal. The SPARC Gen II is an optic that makes you feel like a pro shooter. It’s light, compact, and mounts like a dream on your SIG Sauer MPX. 

You’re good for extended field action with a battery that lasts up to 700 hours on high settings. The 12 illumination settings let you adapt to any lighting condition. Plus, it comes with a lifetime warranty.

Why Not to Buy: But let’s be real. While SPARC Gen II is pretty solid, it has an auto-timer feature that can be annoying. If you’re the type who takes time for that perfect aim, the sight might turn off on you. 

Also, for some, the 700-hour battery life at the highest setting may seem inadequate compared to other models with longer battery longevity.

Who Should Buy: So, who is this sight for? If you own a SIG Sauer MPX and need a reliable, lightweight, and compact sight for rapid target acquisition, this is for you.

The night vision compatibility makes it a good fit for both day and night operations. The SPARC Gen II is worth considering if you’re hunting, engaged in tactical scenarios, or even just spending a day at the range.

My Testing

I equipped the SPARC Gen II on my SIG Sauer MPX and hit the field. Let me tell you, it was quite the experience. The sight is easy to mount, the dot is crisp, and adjusting the settings was easy.


  • Compact & lightweight
  • Comes with accessories
  • Impressive pinpoint accuracy
  • Convenient controls
  • Unlimited lifetime warranty


  • Auto-timer can be disruptive
  • 700-hour battery life might be short for some

6. Vortex Strikefire II – Best for Beginners


Brand: Vortex Color: Black Style: Red/Green Dot Dimensions LxWxH: 7.25 x 6.25 x 3 inches Weight: 0.24 Kilograms. Material: Aluminum. Magnification Maximum: 1x Objective Lens: 30 mm Magnification Minimum: 1 x. Mounting Type: Cantilever Mount

Vortex Optics Strikefire II is a rugged, red/green dot sight. It’s got fully multi-coated lenses, which means better visuals for you. 

Comes with an adjustable cantilever mount. Plus, it’s fogproof, waterproof, and shockproof. The extended battery life can run up to 2 years. All this in a light, single-piece aluminum chassis.

Why to Buy: Here’s what’s good about the Strikefire II. For starters, the price is pretty reasonable, especially  for what you’re getting.

The reticle options, red and green, give you versatility depending on your target and lighting. It’s easy to operate and offers solid battery life. 

The lifetime warranty takes the worry out of your purchase. And hey, you can use it with other equipment thanks to its adjustable cantilever mount.

Why Not to Buy: However, it’s not all sunshine and rainbows. The Strikefire II has an automatic 12-hour shutdown feature. If you’re out on extended sessions or forget to turn it off, you might find your sight powered down at an inopportune moment. 

Some users may find this a tad inconvenient, especially in situations where constant readiness is key.

Who Should Buy: Alright, so who needs this sight? If you’ve got a SIG Sauer MPX and are looking for a durable, versatile sight without draining your wallet, this one’s for you. 

Whether you’re a hunter, a tactical shooter, or someone who loves a good day at the range, the Strikefire II checks a lot of boxes. Plus, the lifetime warranty adds that extra layer of confidence to your purchase.

My Testing

I slapped this sight on my SIG Sauer MPX and took it for a spin. 

Mounting was straightforward, and I loved the red/green reticle options. Honestly, the sight performed admirably, whether I was at the range or navigating more complicated field scenarios.


  • Reasonably priced
  • Red and green reticle options
  • Waterproof, shockproof, and fogproof
  • User-friendly
  • Extended battery life
  • Versatile use
  • Lifetime Warranty


  • The automatic 12-hour shutdown can be a drag

Last Verdict

After rigorous testing and hands-on experience, I’ve reached a verdict. When it comes to finding the perfect red dot sight for your SIG Sauer MPX, it all boils down to individual needs and preferences. 

Whether you’re a novice shooter looking for reliability, a seasoned marksman after the latest tech, or someone who values a robust build, the market has something for everyone. But the 

Holosun 510C takes the cake among the optics I’ve tried and tested. 

While others had their merits, this one felt right in every way. It complements the SIG Sauer MPX like no other and enhances my shooting experience to an entirely new level. 

So, if you’re still pondering over which sight to go for, my money is on the Holosun 510C.


Is Sig Sauer MPX legal? 

The Sig Sauer MPX is legal in the United States and has received ATF approval for sale in the U.S. marketplace.

Is the SIG MPX a good gun? 

The SIG MPX is a great-looking gun that’s easy to use, especially for fans of tactical-style firearms.

Does Sig make good red dots? 

The Sig Romeo5 is a well-made, reliable red dot sight that stands out even in its pricing tier.

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I quit my job as a high-powered lawyer to pursue the outdoors. I spend most of my time fishing and hunting but am also an avid shooter with two years experience writing about firearms related topics.

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