Shield RMSx Review: Testing the Tiny Titan

By Michael Mills
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Shield RMSx Review: Testing the Tiny Titan

September 11th, 2022

9:35 runtime

Let me take you back to a time when cellular phones were the size of a briefcase. Some of you may remember the battery packs attached to the first cell phone that your dad made you carry while he talked on the phone. Then, in what seemed like the blink of an eye, cell phones were the size of a stack of business cards.

Shield RMSx Red Dot Review
A big window and compact footprint are two of the defining features of the new Shield RMSx reviewed by the author.

Now, in the modern era, cell phones have settled out to a certain size for the most part. This is the same with many modern optics. But the new Shield RMSx takes that principle and turns it on its head, by offering you a small footprint red dot with a king-sized window.

Springfield XD-M Elite with Shield RMSx
To test the Shield RMSx, the author mounted it to a Springfield XD-M Elite pistol (shown) as well as a Hellcat.

What’s the Big Difference?

Shield Sights has a line of miniature and micro red dots, from the ultra-small RMSc to the standard RMS. Much like its cellular phone counterparts, the smaller you go, the less window or screen you have. For this reason, Shield decided to bridge the gap and make competitive shooters really happy by offering a miniature-sized optic with a little more window. To be exact, this new design gives you an 80% more viewable window. At the same time, the Shield has given you better LED efficiency, providing clear dots and longer battery life.

Shield RMSx Review
Hornady Critical Defense is considered to be excellent defensive ammo. It performed flawlessly in the RMSx testing.

This optic was specifically designed for those connoisseurs of competition with options like a 4 or 8 MOA-sized dot for quick and easy target acquisition. With auto-brightness, there is no need to worry about not having the right setting when going from one lighting condition to the next. The housing is made of tough aluminum in your choice of nine different colors, ranging from black to purple. It comes in at a light 17.5 grams, making it very light to mount up and keeping your gun’s overall weight as minimal as possible. And the hard dip coating on the acrylic lens is going to give you great clarity and durability.

review Shield RMSx
Along with the RMSx red dot, the author had the reliable Streamlight TLR-1 HL weapon light mounted to the test pistol.

It follows the standard RMS mounting footprint, and I was able to mount it up to my XD-M Elite Tactical OSP and also the Hellcat Pro.

Range Performance

On the range, the extra window size is very noticeable and a nice change from its small counterparts. Even though this was mostly tested on my X-DM Elite, which is a tactical-style pistol, the clarity and size of the glass made target acquisition easy and the overall view very nice. Transitions from target to target were very easy, and even at closer distances the design of the housing gave the maximum view without blocking any of your target. I found the auto adjustment very quick and appropriate for the lighting conditions as the day went on or as I walked around the house from room to room to test the speed of the sensor.

testing the Shield RMSx at the range
The author tested the 4 MOA version of the RMSx red dot optic. He found the larger window made it easier to find the dot quickly.

I opted for the 4 MOA version, and I have to say it was the right choice for me. I like to do some longer ranges with pistols, say 50 yards and beyond, and the 4 MOA version gives me some wiggle room. However, up close that 8 MOA size is very tempting for ultra-fast engagements.

how to adjust the RMSx red dot sight
Shield includes a tool for adjusting the red dot. For sighting in the optic, it proved to be very helpful.

Out on the range, I did have a chance to test the dot in bright sunlight directly to the front. I do this when testing new optics because sometimes you get feedback onto the glass from the LED emitter cover, which was not the case here. Even in the blinding Arizona sun, the glass stayed clear and free from the dreaded red blob you see in some optics when the glass is reflecting the LED emitter surface.

cowitnessing the RMSx sight
The suppressor-height sights on the XD-M Elite allow for a co-witness through the Shield RMSx window.

I found the overall design of the optic window to be quite nice for quick target alignment. On the sides, the window’s edges are straight up and down vertically with no angles until you get near the top. This is where it begins to angle toward the center. I like optic windows that are round across the top and more squared off on the sides since they seem to help me immediately center on a target a little more quickly. The lack of buttons also allows the optic to be a bit more skeletonized, keeping weight down and overall thickness of the sides to a minimum.

Mounting It Up, Zero In

Installing with the RMSx is much like other Shield optics. For the XD-M, you will need to use the appropriate plate per the Shield footprint. When it came to mounting to the Hellcat Pro, it was a direct mount to slide. It will come with the screws you need, a battery, zeroing adjustment tools and an instructional manual via QR code.

Shield RMSx on Springfield XD-M Elite
The Shield RMSx sight has a “trench” in the rear of the body to better allow for the use of standard sights as a backup to the red dot.

Remember, anytime you are mounting an optic, you must use proper torque and a small amount of thread-locking compound to ensure the optic stays put. After mounting, zeroing is quite easy. All you need to do is pick your zero distance, fire a three- to five-shot group and make your adjustment with the included dial and Allen wrench.

Final Thoughts

With a price point coming in under $500 and the options the optic provides, it is a very desirable package. Competitive shooters need every advantage they can get since time can literally be money in their line of work. But this optic is also a great choice for those looking for a quality, proven optic with automated functions that they use on the range. With the size of the glass and clarity of the red dot in the window, I think anyone looking for an optic would be very happy to have this new larger RMSx sitting on their slide.

Editor’s Note: Be sure to check out The Armory Life Forum, where you can comment about our daily articles, as well as just talk guns and gear. Click the “Go To Forum Thread” link below to jump in!

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Springfield Armory® recommends you seek qualified and competent training from a certified instructor prior to handling any firearm and be sure to read your owner’s manual. These articles and videos are considered to be suggestions and not recommendations from Springfield Armory. The views and opinions expressed on this website are those of the authors and do not necessarily reflect the views and opinions of Springfield Armory.

Product prices mentioned in articles and videos are current as of the date of publication.

Michael Mills

Michael Mills

Michael Mills created www.tacticalconsiderations.com as a way to help spread good information, shed positive light on the gun community and to have fun. He has always loved teaching and helping others, especially when it comes to gun rights. This passion was further ingrained during his service in U.S. Army Special Operations, and he is a Use of Force Instructor, Defensive Tactics instructor, DEA Firearms Instructor and Police Academy instructor. He also has 15 years of law enforcement experience from patrol to supervision.

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