Best Red Dot Sight for Sig Sauer MPX

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If you’re a fan of the SIG Sauer MPX like I am, you know that adding a red dot sight can significantly enhance your shooting experience. 

I’ve spent countless hours at the range, rigorously testing various red dot sights specifically for the MPX. 

In this article, we’ll delve into the ins and outs of finding the perfect red dot sight for SIG Sauer MPX.

So, what red dot fits Sig Sauer MPX?

Here are five red dot sights that fit the Sig MPX perfectly.

Sig Sauer MPX Red DotCategoryPrice
SIG Romeo 5Best Overall$125.65
Holosun 510CBest User-Friendly Controls$309.99
Vortex Optics CrossfireHighly Durable$137.22
Trijicon MRO 2.0Best Solid Option$489.99

Top 4 Best Sig Sauer MPX Red Dot

1. SIG Romeo 5 – Best Overall

Sig Sauer Romeo5 1X20mm Tactical Hunting Shooting Durable Waterproof Fogproof Illuminated 2 MOA Red Dot Reticle Gun Sight, Picatinny Mount Included
12,452 Reviews
Sig Sauer Romeo5 1X20mm Tactical Hunting Shooting Durable Waterproof Fogproof Illuminated 2 MOA Red Dot Reticle Gun Sight, Picatinny Mount Included
  • ROMEO5 GUN SIGHT - The ROMEO5 1X20mm Red Dot Sight...
  • 2 MOA RED-DOT - For those avid shooters who admire...
  • MOTAC TECH - The versatile ROMEO5 red dot sight...
  • VERSATILE MOUNT - This gun sight comes with an...
  • WEATHER RESISTANT - The dependable IPX-7 waterproof and...

The Sig Sauer Romeo 5 is a compact, budget-friendly red dot sight built for durability and versatility, ideal for the SIG Sauer MPX.

Housing Material: One of the first things that catch your eye with the Romeo 5 is its aluminum housing. Aluminum isn’t just for show; it’s an industry standard when you’re talking about blending durability with lightweight design. 

But it’s not just any aluminum; this sight has an anodized matte finish. This serves to reinforce the structure, offering added protection against wear and tear. 

So, even after an extended period at the range or out in the field, the sight retains its visual appeal and structural integrity.

Lens Quality: The lenses on this red dot sight aren’t your run-of-the-mill glass; they’re fully multi-coated. Why does that matter? A multi-coated lens improves light transmission, allowing for superior clarity and brightness. 

So whether it’s a sunny day or an overcast afternoon, the Romeo 5 ensures that your target is always well-lit. 

Weather Resistance: Now let’s talk about Romeo 5’s resistance to the elements. Many optics might boast about being water or fog-resistant, but the Romeo 5 is water, fog, and shockproof. 

While you can’t go diving with it, it can take on a downpour like a champ. What really seals the deal is its fog resistance. The internal mechanisms are sealed, which keeps the moisture out, ensuring that your lenses stay clear even on the most humid days. 

That said, always make sure to wipe it down after exposure to harsh conditions to extend its lifespan.

Battery Life and Settings: With 40,000 hours of battery life, you’re looking at an optic that can run for almost five years on a single CR2032 battery. 

Its MOTAC (Motion Activated Illumination) technology is fantastic, automatically turning the sight on when it senses movement. This not only makes it quick on the draw but also contributes to its impressive battery longevity. 

The sight has 10 illumination settings, including two that are night vision compatible, giving you a wide range of options to adjust according to the environment.

Reticle and MOA: The 2 MOA dot size is the gold standard for red dot sights. It provides enough focus for medium-range engagements without being too large that it obstructs your field of view. 

The red dot is sharp and crisp, making target acquisition almost instantaneous. Whether you’re at the range or out hunting, this red dot makes aiming significantly more straightforward.

Why I Love It: I love the Romeo 5 because it’s a no-nonsense, reliable red dot sight. It offers excellent features like long battery life, weather resistance, and a crisp 2 MOA dot, all without breaking the bank. 

It feels like a sight that should cost twice as much, and when it’s mounted on my SIG Sauer MPX, it’s like they were made for each other.

My Experience

The moment I mounted the Romeo 5 on my SIG Sauer MPX, it felt like a match made in heaven. Quick target acquisition became second nature, even in varying lighting conditions. 

Despite its affordability, the durability held up brilliantly, even after extended sessions at the range. And honestly, the MOTAC feature made my life so much easier by preserving battery life.


  • Exceptional battery life
  • Robust, durable design
  • Easy to install and adjust
  • Versatile illumination settings


  • Not suitable for nighttime use without additional equipment

2. Holosun 510C – Best User-Friendly Controls

HOLOSUN HS510C Multi-Reticle Green 2 MOA Dot & 65 MOA Circle Open Reflex Sight for Long Guns - Shake-Awake Solar FailSafe Waterproof Sight (HS510C)
  • HOLOSUN RED DOT SIGHT - The HS510C sight is a versatile...
  • MULTI-RETICLE SYSTEM - This Holosun red dot sight is...
  • SHAKE AWAKE TECHNOLOGY - Extends battery life by...
  • SOLAR FAILSAFE - If your battery fails, this red dot...
  • SPECIFICATION - Reticle: Red 2 MOA Dot & 65 MOA Circle;...

The Holosun HS510C offers top-notch optics with a robust feature set, perfect for enhancing your shooting game.

Material and Build Quality: One of the standout features of the HS510C is its build quality. Crafted from high-grade aluminum, this sight doesn’t just look good; it’s built to last. 

Now, let’s talk durability. This sight is water-resistant, fog-proof, and shock-proof. So, if you find yourself caught in a downpour or navigating through misty conditions, the HS510C won’t let you down. 

Lens and Reticle: The lens on this bad boy is something else. It’s big, and that’s a game-changer. A larger lens gives you a broader field of view, which is essential for quick target acquisition. 

As for the reticle, you get a highly accurate 2MOA red dot, which is glass etched, meaning you don’t have to worry about reticle dislocation, a common issue in cheaper models. 

The dot is bright and clear, providing you with the utmost accuracy when you need it most. What’s more, this sight offers unlimited eye relief, which is pretty neat for maintaining situational awareness and rapid transitioning between targets.

Battery and Power Options: The HS510C runs on a CR2032 battery, which isn’t rechargeable but is easily replaceable. In terms of battery life, it’s nothing short of impressive. 

With 10 brightness settings and two-night vision options, this sight covers all your needs, be it day or night. But here’s where things get really exciting: this model comes with a Solar Failsafe system. 

This additional power source can prolong the battery life significantly, adding an extra layer of reliability. So you get extended usage without worrying about running out of juice in critical moments.

Windage and Elevation Adjustments: A sight isn’t much good if it doesn’t stay true, right? The HS510C lets you adjust windage and elevation with finesse. 

The controls are responsive and provide tactile feedback, which is incredibly reassuring. You can feel each click as you make your adjustments. 

Why I Love It: What’s not to love about the Holosun HS510C? It’s like the Swiss Army knife of sights: versatile, reliable, and packed with features. 

From its sturdy build to its extensive power options, this sight has got it all. I’m particularly smitten by its Solar Failsafe system, an absolute lifesaver in extended-use scenarios. Its suitability for the SIG Sauer MPX makes it even more appealing to me.

My Experience

I mounted the HS510C on my MPX and took it for a field test. The first thing I noticed was the quick target acquisition, thanks to the large lens. 

The 2MOA red dot reticle didn’t disappoint either, offering pin-point accuracy. Despite its slightly hefty weight, the sight performed exceptionally well in different shooting conditions.


  • Durable, high-quality material
  • Large lens for quick target acquisition
  • Extended battery life with Solar Failsafe
  • Easy windage and elevation adjustments


  • A bit on the heavy side

3. Vortex Optics Crossfire – Highly Durable

Vortex Optics Crossfire Red Dot Sight Gen II- 2 MOA Dot (CF-RD2)
  • The updated Crossfire is a no-nonsense sight for near...
  • With up to a 50,000 hour battery life, the sight will...
  • The 2 MOA dot is quick to acquire in close-quarters,...
  • Increased light transmission with multiple...
  • Highly durable hard-coat anodization provides a...

The Vortex Crossfire Red Dot Sight Gen II is an affordable and efficient sight, ideal for quick target acquisition on your SIG Sauer MPX.

Optics Quality: When it comes to optics, you’ll find that the Vortex Crossfire Gen II doesn’t disappoint. The sight employs full multi-coatings, which means it dramatically reduces glare. 

These coatings work to enhance visibility in a variety of lighting conditions. In the field, the clarity of the glass and the crispness of the 2 MOA red dot sight were on point. 

Whether in broad daylight or the dimming hours of dusk, the reticle was sharp and clear, enabling rapid and precise target acquisition.

Waterproof and Fog-Proof Construction: Nothing dampens a shooting experience more than a sight that fogs up in humid weather or fails when it gets a bit wet.

With the Vortex Crossfire, that’s not an issue. The sight is sealed with an O-ring, making it resilient against water and fog. During my field test, it rained intermittently, but the sight held up flawlessly, maintaining a clear and unobstructed view.

Brightness Adjustments: You can’t control the lighting out in the field, but you can control how well your sight adapts to it. 

The Crossfire comes equipped with 11 different brightness settings, two of which are compatible with night vision. A smooth turn of the brightness knob allows for rapid adjustments, letting you adapt to changing lighting conditions in real time.

Exceptional Battery Life: One of the most compelling features of this sight has to be its extended battery life. Powered by a CR2032 battery, it offers up to 50,000 hours of use. 

Let’s face it: frequently changing batteries during a shooting session can be an unnecessary distraction. But with the Vortex Crossfire, you’re set for quite a long time before needing a replacement.

Illumination Knob Design: Although there’s a lot to like about this sight, the illumination knob design does leave some room for improvement. Its close proximity to the windage turret can make adjustments a bit cumbersome, especially when you’re in a hurry.

Why I Love It: What’s not to love about a sight that brings together quality, durability, and versatility? The Vortex Crossfire Gen II offers a premium shooting experience without breaking the bank. It stood up to the elements and delivered consistent performance, making it an indispensable addition to my SIG Sauer MPX.

My Experience

From clear optics to adaptable brightness settings, this sight elevated my shooting experience in a way that was immediately noticeable. Its durability proved invaluable in less-than-ideal conditions, reassuring me of its long-term reliability.


  • Crystal-clear optics with multi-coatings for better visibility
  • Waterproof and fog-proof design ensures durability
  • Variety of brightness settings to adapt to multiple lighting conditions
  • Extended battery life negates the need for frequent replacements


  • The placement and design of the illumination knob could be improved for quicker adjustments.

4. Trijicon MRO 2.0 – Best Solid Option

Trijicon MRO-C-2200030 Miniature Rifle Optic (Mro) Sight, 2.0 MOA Adjustable Green Dot with Full CW Mount, Matte Black
  • Product Type: Sporting Goods
  • Item Package Dimensions: 12.6 L X 16.1 W X 17.1 H (Cm)
  • Country Of Origin: United States
  • Item Package Weight: 0.543 kgs

The Trijicon MRO is a versatile 1x red dot sight that offers great compatibility and performs exceptionally well with a magnifier on the SIG Sauer MPX.

Large Field of View: Let’s get right into it: the field of view on the Trijicon MRO is expansive. Whether you’re in the woods hunting or at the range, having a large field of view is a big deal for situational awareness. 

You can keep both eyes open, track your target, and make precise shots with ease. It’s no wonder the sight is designed for maximum situational awareness; it allows you to quickly identify and engage targets in your peripheral vision.

Easy-to-Adjust Windage and Elevation Knobs: Ever had a sight that felt more like a jigsaw puzzle when you needed to make adjustments? Well, you won’t have that problem here. The knobs are tactile and well-protected. 

You won’t accidentally knock them and change your settings. In the field, I found the adjustability to be highly intuitive. The tactile feedback gave me a sense of accuracy and precision with each click.

Excellent Eye Relief: Eye relief with this sight is just superb. You don’t need to keep your eye glued to it to get a clear view of your target. 

Especially when you’re out in the field, comfort and ease of use are crucial, and the MRO delivers. This feature can make all the difference in high-stress scenarios or extended periods of use.

Robust Build: The MRO is made from 7075 T6 aluminum alloy, built to withstand whatever you can throw at it. It’s clear that this is a sight that’s designed for rugged use. Whether it’s heavy rain or just a rough day at the range, this sight takes it all in stride.

Top Brightness Adjustment: One unique design feature that can’t be overlooked is the brightness adjustment knob, located on the top of the optic. 

This placement eliminates side obstructions, giving you a clean, clear view of your target at all times. Adjusting brightness was a cinch, allowing me to adapt to different lighting conditions effortlessly.

Why I Love It: This sight checks all the boxes: durability, ease of use, and great features for both casual shooting and more serious pursuits. 

My Experience

Strapped to my SIG Sauer MPX, the MRO was a game changer. From its sturdy build to its expansive field of view, this sight didn’t miss a beat. 

Every feature felt optimized for real-world performance. Simply put, it’s obvious that the MRO was crafted with the user in mind.

Compare Trijicon MRO Vs Sig Sauer Romeo 5


  • A large field of view enhances situational awareness
  • Tactile and protected windage and elevation knobs
  • Exceptional eye relief for greater comfort
  • Robust build ensures long-lasting durability
  • Excellent compatibility with magnifiers and night vision devices


  • On the pricier side compared to other options

Final Verdict

Having spent a considerable amount of time at the range, I can say without a shred of doubt that each of these red dot sights brought something special to the table when paired with the SIG Sauer MPX. 

Yet, when the dust settled, one emerged as the clear winner: SIG Romeo 5. This isn’t to undermine the other options; it’s just that the Romeo 5 edged out the competition in a way that syncs perfectly with what I look for in a red dot sight. 

Remember, the best sight is highly dependent on your individual needs and preferences, so it’s crucial to weigh each option against what you find most important in a sight.


How accurate is the SIG MPX?

Based on my experience, the SIG MPX is extremely accurate. It groups very tightly at distances of 25-50 yards, thanks to its superior ergonomics and quality barrel.

What is the effective range of the SIG MPX-K?

The effective range of fire for the SIG MPX-K is around 50-75 meters.

What is a 2 MOA red dot at 100 yards?

A 2 MOA red dot will cover 2 inches of your target at a distance of 100 yards.

Can the SIG MPX be full auto?

Yes, full-auto kits are available for the SIG MPX, including components like a full-auto trip bar, sear pin, and two roll pins.

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I'm Micheal, an avid shooter and hunting enthusiast from Texas. I'm a recreational shooter who loves to spend time at the range and enjoy learning about new firearms and gears. I love to write about guns and share my passion for shooting with others.

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