Please note that some of the links on this site are affiliate links and we earn from qualifying purchases. This does not cost you anything extra, but it helps us keep the lights on. Thank you for your support!
Red dot optics for pistols have come a long way, and Sig Sauer has been at the forefront of innovation with their Romeo series. The Sig Romeo X Pro is their latest offering, designed specifically with a Leupold DeltaPoint Pro footprint.
Sig promises top-tier durability, reliability, and performance, but how does it actually hold up? I put the Sig Romeo X Pro through its paces to see if it’s truly one of the best pistol red dots on the market. Let’s dive in.
Sig Sauer Romeo X Overview
The Sig Romeo X Pro is a rugged open-emitter or enclosed emitter red dot sight designed for optics-ready handguns using the Leupold DeltaPoint Pro footprint. It features a lightweight yet durable 7075 aluminum housing and an aspherical glass lens for a crisp, distortion-free sight picture. The optic comes in two color options: black and flat dark earth (FDE). For this review, I’m using the FDE Open Emitter option, which complements my FN 509 build perfectly. For the full FN509 Build Breakdown Click here! (Coming March 2025)
Sig offers the Sig Romeo X Pro with three reticle options: a 2 MOA dot with a 32 MOA circle, a 3 MOA dot, and a 6 MOA dot. The version I’m reviewing is the 2 MOA dot with the 32 MOA circle.
What’s in the Box?
- ROMEO-X PRO 1x24mm Open Reflex Sight
- CR1632 Battery
- M4 Torx Mounting Screws (PRO)
- T6 & T10 Torx Wrenches
- Operator’s Manual
Technical Specifications
| Feature | Specification |
|---|---|
| Overall Length | 1.83″ (46.5mm) |
| Overall Height | 0.94″ (23.9mm) |
| Overall Width | 1.22″ (31mm) |
| Weight with Battery | 1.15 oz (42.5g) |
| Magnification | 1x |
| Clear Aperture Diameter | 24mm |
| Reticle Options | 2 MOA red dot / 32 MOA red circle, 6 MOA red dot, or 3 MOA green dot |
| Battery Type | CR1632 |
| Battery Runtime | Up to 20,000 hours (continuous at medium setting, dot only) |
| Overall Elevation Travel | 80 MOA |
| Overall Windage Travel | 80 MOA |
| Brightness Settings | 15 (12 daylight, 3 NV) – GEN3+ Night Vision compatible |
| Water Resistance | IPX7 |
| Windage/Elevation Adjustment | 1.5 MOA per click |
Key Features
Enclosed or Open Emitter Design
The Sig Romeo X Pro features a closed or open-emitter design option, to really cater to everybody’s wants or needs. It’s not interchangeable so before you purchase make sure you pick which one you want. I went with the Open Emitter Option.
MOTAC (Motion Activated Illumination)
Equipped with MOTAC technology, the Sig Romeo X Pro conserves battery life by automatically powering up the reticle upon sensing motion and powering down when inactive. This ensures the optic is always ready for use while extending operational time.
MAGNETAC (Magnetic Activation)
The MAGNETAC feature provides an additional layer of activation, utilizing magnetic sensors to detect when the firearm is drawn, instantly activating the reticle. This technology enhances readiness in critical situations.
ALT (Aspheric Lens Technology)
Incorporating Aspheric Lens Technology (ALT), the optic delivers a distortion-free sight picture. The precision-molded aspherical glass lens virtually eliminates aberrations, providing a clear and accurate view of the target.
SpectraCoat Lens Coatings
The Sig Romeo X Pro utilizes SpectraCoat lens coatings, which offer superior light transmission and reduced surface reflections. This results in a bright, crisp sight picture, even in challenging lighting conditions.
D.A.R.C. (Dark Adaptive Reticles & Coatings)
Featuring D.A.R.C. technology, the optic is optimized for low-light environments. This includes reticle brightness settings compatible with night vision devices and lens coatings that enhance clarity in darkness, ensuring effective target acquisition in all lighting conditions.
Versatile Illumination Settings
The Sig Romeo X Pro offers 15 illumination settings, including 12 for daylight and 3 compatible with night vision. This range allows users to adjust reticle brightness to match ambient lighting, ensuring visibility across various environments.
Designed, Tested, and Assembled in the USA
The Sig Romeo X Pro is engineered, tested, and assembled in the United States, reflecting Sig Sauer’s commitment to quality and precision manufacturing. Each unit undergoes rigorous testing to ensure reliability and performance in demanding conditions.
Design and Build Quality
The first thing that stood out to me about the Romeo X Pro was its rugged/sharp-looking design. It has a duty-ready feel while still looking sleek and modern kinda reminding me of fighter jet body lines. The FDE version I chose leans more brown than tan, but it still looks awesome on my FN 509 build. The finish is flawless, with subtle and well-placed branding, the Sig logo is engraved on the left side, while “Romeo X” is engraved on the top. I always love subtle branding nothing to over the top, and not too little it looks cheap.
The battery cover is easy to access and features an O-ring seal to help with waterproofing. The threads are smooth, making battery changes quick and hassle-free. One of my favorite features is the built-in co-witness iron sights paired with its low deck. My rear sights still serve as the primary, but the optic provides a great view of the front sight, sitting cleanly just at the bottom of the sight picture.
The sight window itself is a good size, more in line with an RMR-sized window. The reticle is crisp and clear, and the aspherical glass lens is sharp, though it does have a noticeable blue hue, likely from the lens coatings. One of those coatings is designed to help with reflection, and while it doesn’t eliminate reflections completely, it does a great job of reducing them.
The illumination buttons on the side feel extremely durable. They are small and out of the way but still easy to press and adjust. The black housing around the buttons contrasts nicely with the FDE… or should I say brown coating.
While the optic may look a little blocky, due to it being an open emitter pretty much in an enclosed emitter body. The shape really goes unnoticed and doesn’t feel like it adds much bulk at all once mounted. As for fitment in the Leupold DeltaPoint Pro footprint, I can’t say much about the general fit since I had my slide cut by Vulcan Machine Works for a DPP footprint. I also supplied them with the Romeo X Pro to ensure a perfect fit, which was achieved with zero gaps or movement. Highly recommend them if you need an optic cut!
Performance
After putting 700+ rounds through my FN 509 build so far with the Romeo X Pro mounted, I’ve been thoroughly impressed with its performance. The illumination settings work great, keeping the reticle crisp and clear in all lighting conditions. I haven’t experienced any malfunctions, flickers, or issues with the optic yet… besides one, so I’ll touch on that really quick.
Early on, I would say the first 100 rounds or so, it did feel like the reticle was walking slightly, but after a quick re-zero, it has held solid with no further issues. I’ll chalk that up to user error for now, but if it happens again, I’ll definitely update my thoughts. As of now, no points lost in this category.
The 2 MOA dot with the 32 MOA circle is excellent for fast target acquisition at close range, making it easy to track and engage targets quickly. However, past 20 yards, the larger circle can make precise shots a little more difficult, but switching to just the 2 MOA dot is simple, just hold down the brightness down button for a few seconds to cycle through reticle options. Even after multiple reticle changes, zero has held perfectly.
The glass clarity is super clear, and while the blue hue is noticeable, it doesn’t interfere with visibility. I was initially unsure how I’d feel about it, as I wasn’t a fan of the blue hue on the top of the glass on the Holosun AEMS Core, but with the Romeo X Pro, the hue is consistent across the entire lens and blends in naturally. Also makes it really does enhance your vision in low light environments which I was very impressed with.
Battery life has been great so far. I’ve kept the optic on for the past three to four months, and since I don’t use it every day, the MOTAC system has been doing its job in preserving battery life. One thing I do wish the optic had is an auto-brightness adjustment, when moving from a dark or dimly lit area to a bright environment, I have to adjust it manually. Which can get kinda annoying especially on a pistol that you carry in different lightings.
The low deck height is another feature that really stands out to me. It allows me to co-witness with my factory iron sights, which sit right at the bottom of the sight picture. Having that backup sighting option without needing suppressor-height irons is a major plus.
One small detail I absolutely love is that the Romeo X Pro remembers the last reticle setting used when turning the optic on or off. Many optics reset to a default setting, forcing you to cycle through reticles every time, but this one remembers your last setting, making for a much smoother experience. JUST ADD AUTO BRIGHTNESS!
Overall Rating
Reliability and Performance – 4.5/5
I’ve experienced zero malfunctions with the Romeo X Pro after over 700 rounds. The zero issue I initially noticed was likely user error during the first zeroing session, and after re-zeroing, it has held strong for 500+ rounds with no signs of movement. I’m keeping an eye on it, but for now, no major concerns.
Sight Picture – 3.8/5
The blue hue on the glass goes unnoticed during use, and while the glare reduction coating does help dim reflections, it doesn’t eliminate them entirely. The reticle is crisp, the glass is clear, and the window size is decent. The one thing I really wish it had is an auto-brightness setting, as manually adjusting it when transitioning between lighting conditions can be a hassle.
Design and Build Quality – 4.8/5
The FDE color leans more brown than tan, but the finish is flawless and looks great on my FN 509 build. The 7075 aluminum housing is extremely durable, and the buttons and adjustments are well-designed with a solid tactile feel. The optic comes with the correct tools for installation and adjustment, which is always a nice touch.
Ergonomics – 4.6/5
Some may assume the Romeo X Pro is bulky due to its boxier design, but in use, it really goes unnoticed when carrying or shooting. The design resembles an enclosed emitter housing, even though it’s an open-emitter optic, which gives it a unique look. Its due to them making the option to purchased an enclosed emitter model. The low deck height is great for co-witnessing iron sights, and the buttons are easy to manipulate without being in the way.
Value – 4.0/5
With an MSRP of $469.99, the Romeo X Pro sits in the premium pistol optic category. However, it can often be found for less at retailers like Brownells or OpticsPlanet. Some may see the price as steep, but the same has been said about the Trijicon RMR and this optic delivers comparable build quality, durability, and performance. While it’s not a huge bargain and doesn’t have the reputation of the RMR, it offers a fair value for what you get. If you want a high-performing, rugged, and great-looking optic, this is a solid investment.
Overall Score – 4.4/5
Final Thoughts
After spending significant time with the Romeo X Pro on my FN 509 build, I can confidently say it’s a well-built, reliable optic (so far) that delivers solid performance. The durability and rugged design give it a duty-ready feel, and the low deck height makes it an excellent option for those who want to co-witness with standard iron sights. The reticle options are versatile, and the glass clarity is impressive, even with the slight blue hue.
That said, I do wish it had an auto-brightness setting for quicker adjustments in changing lighting conditions, and while the glare reduction coating helps, there can still be a minimal glare in certain angles. The initial zero shift I experienced was likely user error, but I’ll continue to monitor it to see if it happens again.
For the price, the Romeo X Pro competes well with other premium pistol optics. It may not be the absolute best value option, but it’s a high-quality red dot that delivers on durability, usability, and performance. If you’re looking for a robust, full-size pistol optic that looks great and performs even better, this one is worth considering.
FAQ – Sig Romeo X Pro
Is the Romeo X Pro an enclosed or open-emitter red dot?
The Romeo X Pro is available in both open and closed-emitter designs, but this review focuses on the open-emitter version.
What reticle options are available for the Romeo X Pro?
It comes with three reticle options: 2 MOA dot with a 32 MOA circle, 3 MOA dot, and 6 MOA dot.
What footprint does the Romeo X Pro use?
The Romeo X Pro uses the Leupold DeltaPoint Pro footprint, making it compatible with many optics-ready handguns.
Does the Romeo X Pro have an automatic brightness adjustment?
No, it does not have an auto-brightness feature. Brightness must be adjusted manually using the side buttons.
How long does the battery last?
Battery life is rated for up to 20,000 hours on a CR1632 battery when set to a medium brightness level.
Does the Romeo X Pro co-witness with standard iron sights?
Yes, thanks to its low deck height, the optic allows for co-witnessing with standard-height iron sights on most pistols.
Is the glass completely clear?
The lens has a blue hue, which some may live some may hate but really goes ultimately unnoticed. However, the sight picture remains clear and sharp.
Is the Romeo X Pro waterproof?
Yes, it has an IPX7 water resistance rating, meaning it can be submerged in up to 1 meter of water for a short period.
Can the reticle be changed?
Yes, holding the brightness down button for a few seconds cycles through the available reticle options but only with the 2 MOA dot and 32 MOA circle model.
Where is the Romeo X Pro made?
The Romeo X Pro is designed, tested, and assembled in the USA.
Would I recommend it?
Absolutely.
Don’t forget to subscribe to our newsletter, so you don’t miss our Next Build.
Click Here To see our Last Post: Holosun AEMS Core Review: Is This the Best Compact AR Red Dot?
We Want to Hear From You!
Have you had a chance to try the Sig Sauer Romeo X Pro? What are your thoughts on its performance and features? Share your experiences and insights in the comments below to help others in the community make informed decisions.
Stay Updated
Don’t miss out on our Giveaways, upcoming reviews and expert insights into the latest in firearms technology. Subscribe to our newsletter for the latest updates and follow us on our social media channels to stay connected with a vibrant community of firearms enthusiasts and experts.
Leave a Reply