Shield RMSc Micro Red Dot Sight
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The micro-compact pistol market has gained lots and lots of steam in recent years. Small guns with higher capacity go a long way, and part of that micro-compact appeal is the modern capabilities they offer. That includes the ability to mount an optic, and without the Shield RMSc red dot sight, the micro-optic market might have stalled out. They took mini red dots and made them micro-sized.

Shield RMSc Micro Red Dot Sight
It’s tiny, but capable. (Travis Pike for TTAG)

These days companies like Holosun, SIG SAUER, Riton, Crimson Trace and more owe the original Shield RMSc a little credit. Tons of companies use this footprint and its ofund on SIG and Glock slides. With that said, does the OG micro red dot still hold up?

That’s what I aimed to find out when I got my hands on one of the newer RMSc optics. What’s new is the presence of a glass lens over the former polymer lens. Shield builds all of its sights in the United Kingdom and it’s my first experience with optics from across the pond.

A Little Fella With Big Potential

Shooters can choose from an RMSc with a 4 MOA or 8 MOA reticle. I went with the 4 MOA version and, as mentioned, the glass lens. The polymer lens is still available and a little less expensive. The glass lens delivers a clear picture with a sharp dot and no noticeable tint. It’s crystal clear and easily one of the clearest pistol red dots I’ve ever handled.

Shield describes the lens as having a hard coating, anti-reflective properties and no colored coating applied.

Shield RMSc Micro Red Dot Sight
The RMSc is designed for the smallest handguns. (Travis Pike for TTAG)

The RMSc is super tiny and very lightweight. It’s also probably one of the most stripped-down designs I’ve ever seen. The battery loads in the bottom, and the optic lacks any kind of buttons at all for activation and adjustment. There are the adjustment knobs, and that’s it.

Brightness adjustment is automatic only. The lowest automatic adjustment can be seen under night vision optics, and the brightest setting supposedly can be seen against the sky in bright daylight. In my experience, this works well. I took it out at high noon in Florida to see how bright it gets. I had no trouble seeing the bright reticle of the RMSc, even while wearing sunglasses.

Shield RMSc Micro Red Dot Sight
It’s super clear with no discernible tint. (Travis Pike for TTAG)

The dot dims and increases in intensity quickly and intuitively as the light changes. The adjustment was so fast that I was amazed going from room to room and seeing how the reticle changed brightness.

Bright Lights

One problem with auto-adjusting dots is using a white light with one. Most of the time, the dot doesn’t adjust to the light in front of it, only the light that’s over it. A white light will often wash them out.

To see if that’s an issue with the RMSc, I went into a dark room with a powerful 1,000 lumen light for ASP and hit the button.

Shield RMSc Micro Red Dot Sight
The little RMSc worked extremely well in all environments. (Travis Pike for TTAG)

I set the light in front of the gun and could see the RMSc’s dot without issue. I moved the light beside the optic and behind the optic and still had no washout issues. Pretty impressive.

It should also be stated you can’t turn the RMSc off. The red dot is always on, but if you slip the included rubber cover over the optic when not in use, it automatically adjusts to the lowest battery sipping level. With battery life rated at between two to three years, that’s not a problem. Change out out on your birthday or January 1 every day and your RMSc will always be working.

The RMSc On the Gun

I tossed the RMSc on my new SIG P322. With ammo prices being how they are, I’ve been shooting the P322 a ton. Installation is simple, and once the two screws are torqued down, you’re good to go.

At the back of the optic sits a small notch that acts as a rear sight. The RMSc sits low enough to co-witness with standard height sights.

Shield RMSc Micro Red Dot Sight
The little notch allows you to co-witness with standard height sights. (Travis Pike for TTAG)

That rear notch is quite handy and a very nice feature for use with a gun like the P322, where the rear sight is removed to install the optic. Once mounted, I started zeroing and shooting. The optic comes with the Allen key needed to make the adjustments. You insert the Allen key into this wheel-like device that gives you the adjustment information.

Each click is a ¼ MOA at twenty yards. That measurement is odd for an optic, but it makes sense on a handgun. How far are you going to zero your handgun optic? I zero at ten yards, which will carry me quite far with a handgun.

Shield RMSc Micro Red Dot Sight
Shot one on the right…then measurements and adjustments were made to get the last three shots. (Travis Pike for TTAG)

The adjustments are tactile. You can feel each click, but can’t hear it and they’re dead on. I shot a round, measured to the bull’s eye, and then made the adjustments, and well, you can see the photos for yourself.

Blasting Away

I’m not the type who thinks you have to have a red dot on your handgun, but if you asked me a yes or no question, it’d always be yes. With the RMSc mounted to my P322, I hit the range starting at ten yards and moving rearward. At 25 yards, I had no issues ringing a four-inch gong over and over and over.

Shield RMSc Micro Red Dot Sight
A red dot and aP322 get along really well together. (Travis Pike for TTAG)

The 4 MOA dot remains clear and precise. It’s a well-designed optic, and the clear and crisp dot is an indicator of a high-quality optic.

Beyond twenty-five yards, hitting the two-inch gong was a little harder, but certainly not impossible. The 8-inch gong went ding, ding with ease even at 50 yards in an unsupported, standing position. My 6-inch gong was easy to hit at this range, and 75% of those rounds hit the target at 50 yards.

Shield RMSc Micro Red Dot Sight
At 25 yards I felt like a mini sniper. (Travis Pike for TTAG)

That’s the real joy of a dot on a handgun. The second joy is speed, and the 4 MOA dot certainly makes you want to go fast. So I went did.

Combine a dot with a full-sized .22LR pistol, and we get a gun that’s ripe for personal bests on drills. I shot an all-black 10-10-10 drill in six seconds, a clean iHack, and an El Presidente that would make Jeff Cooper proud.

Shield RMSc Micro Red Dot Sight
This included adjustment dial makes zeroing easy. (Travis Pike for TTAG)

Sure, the recoil of a .22LR certainly makes things easier, but shooting with the dot is much faster than aligning sights and easier to track. The RMSc makes all of it fast, accurate and easy.


Length: 1.7 inches
Height: .9 inches
Width: .9 inches
Weight: .57 ounces
MSRP: $429.99 (about $370 retail)

Clarity * * * * *
This is the clearest micro pistol optic, and hell, the clearest pistol optic I’ve ever used. There is no tint, the dot is very precise, and it’s incredibly well clear. Color me impressed.

Features * * * *
The auto-adjusting brightness level actually works. Not just for target shooting, but for a number of diverse situations. The rear notch and low-slung design make it easy to co-witness naturally with your stock iron sights. Some folks might be turned off by the lack of manual adjustment…but I don’t mind it.

Value * * * *
Admittedly the glass lens Shield RMSc isn’t inexpensive, with a street price hovering around $370. Yet this is a very high-quality product, and the new glass lenses have taken it to the next level.

Overall * * * *
I’ve used both the SIG RomeoZero and Holosun 507K and enjoyed both, but the Shield RMSc is the first micro red dot to truly impress me. Maybe the Brits really can build a nice optic.

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  1. 4″ gong at 40yds is not a sure thing. i hit it more often with my friends p10 with red dot than open sights. this looks nice and the price is fair.
    i’ve only have used trs25’s.

  2. My wife wants a dot for her 9mm shield, this just jumped up the list. Glass lenses just seem less prone to scratching.. I’m looking for a smaller dot for my ruger 22/45, maybe if I get her one she’ll get me one?

    • Glass don’t scratch, it breaks, rendering the optic useless, and possibly obscuring the irons.

  3. OK I can see some point for target shooter. Well RED DOT .22 Target Shooters to be correct. But as for those ‘other situations’ what exactly would they be then? I’d maintainn that in any real life situation where a handgun was a nessessity the Military and Police Forces would have surely sussed them out would they not. I can surely see some point of Red Dot in Long Guns in Policing sitations though just to let the bad guys and gals know where you’re at. But Military wise the last bloody thing you need is for that kind of bad guy to know you’ve lined him or her up!
    I’ve done my share of FIBUA and HOUSE CLEARANCE back in the day in the UK Army Infantry Reserves and I can assure you we did not rush around advertising ourselves with Red Dots. House/Room Clearance were well seperated teams of two or three [any more got in each other’s way withn the risk of a Blue-on Blue. Witness the UVALE video] , a couple of Flash Bangs and full mags

    • USSOCOM uses the Trijicon RMR on their Glock 19s, and the Army’s Premier Special Operations Unit uses red dots on their handguns. So do the US Marshals Special Operations Group

    • “I’ve done my share of FIBUA and HOUSE CLEARANCE back in the day in the UK Army Infantry Reserves and I can assure you we did not rush around advertising ourselves with Red Dots. House/Room Clearance were well seperated teams of two or three [any more got in each other’s way withn the risk of a Blue-on Blue. Witness the UVALE video] , a couple of Flash Bangs and full mags”

      you have done no such thing.

      According to your postings; First you were in the UK Army Cadet corps, then you were in the active UK Air Force, then in the active UK Army, and now you were in the UK Army Infantry Reserves. Then you were in your 50’s in past postings then suddenly in your post the other day you are in your mid 80’s but you claimed to have participated in certain military firearms training at the age of 14 in the UK Army Cadet corps with a rifle that stopped being used by the UK Army Cadet corps before you were born if you are in your mid 80’s, and now you claim training in UK Army Infantry Reserves when you have in pasts postings indicated clearly you don’t know a thing about the subject of which you post now.

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