Trijicon MRO SD Reflex Sight: Ready for Rifles

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It’s hard to believe, but Trijicon’s MRO (Miniature Rifle Optic) celebrated 10 years of production in 2025. That may not seem like a long time for most products, but a decade in production without major upgrades makes a modern electro-optic a bit long in the tooth. While it did get a tweak with the MRO HD model in 2020, there was still room for improvement.

That’s exactly what Trijicon did with the introduction of the new MRO SD. This optic offers everything you love about the MRO and MRO HD’s rugged, reliable design with some noteworthy improvements, starting with the adjusters.

The new adjusters are designed to hold zero under impact or very heavy recoil. They sit below flush, with 1/2 m.o.a. click adjustments and 70 m.o.a. of windage and elevation adjustment. The capless design is wonderful because you can quickly adjust elevation and windage without removing a cap, and since there are no caps to unscrew they cannot be lost. The low-profile design is also very sleek when compared to optics with capped adjusters.

The adjustments offer a tactile and—if your hearing’s better than the average gun writer’s—audible clicks to verify adjustment. Trijicon ships the MRO SD with a clever adjustment tool, but I simply used the rim of a 5.56 case, and it worked quite well.

The Nuts and Bolts

The reticle on the new SD model is a crisp two m.o.a. dot in red or green. Both red and green versions of the MRO SD offer eight brightness settings. Two of those are night vision, five are daylight settings, and there’s an extra-bright setting that’s perfect in full sun or when running a white light on your rifle.

Each unit is powered by a CR2032 battery, and battery life for both versions is exceptional. Expect 2.5 years of continuous runtime on the daylight 3 setting for the red dot version and three years for the green dot. There’s an Off setting located between the daylight 2 and daylight 3 settings that allows shooters to power the unit off and save battery, but also move to one of these intermediate daylight brightness settings with a single click.

The MRO SD’s forged 7075 housing is fully sealed and is waterproof to 100 feet. The pressure at that depth is four bar or roughly 60 psi, four times the surface pressure, and the fact that the Trijicon doesn’t leak at that depth is considerably better than optics with a standard IPX7 rating, which is submerged only to 30 feet. That may not mean much to the everyday user, but it does testify to how ruggedly this sight is built.

The MRO SD has a 25 m.o.a. multicoated objective lens that provides good color and is free of distortion. It’s noticeably wider than the objective lenses of other carbine red dots, and it gives you faster target acquisition and reduces the “tube effect” that’s inherent to so many red dots—a form of tunnel vision that occurs with small-diameter optics and can be hazardous in defensive situations.

Field of View

With the MRO SD you get an appreciably larger window and a wide field of view that promotes two-eyes-open shooting. Further, the objective lens has been optimized to function with Trijicon’s MRO 3X rotating magnifier, and the MRO SD is offered as a combo package with the magnifier included.

In addition to the reticle options, there are more than a dozen variations including black or coyote brown anodized colors with low, full or lower-third co-witness bases. There’s also an option to buy the optic without a base. There’s also a patrol MRO SD model that comes with flip caps, an anti-reflective device and a quick detach mount.

My sample featured a red dot, full co-witness base and anodized black exterior, and I mounted it on Smith & Wesson’s new M&P15 Axe 16-inch rifle in 5.56/.223. The Axe’s flip-up irons co-witnessed perfectly with the MRO SD.

I conducted a box test at 50 yards, moving the sight eight clicks in all four directions. I chose this distance because at 50, changes in point of impact are almost entirely due to the adjustments and not shooter error, which can occur with red dots at longer distances. With the MRO SD, point of impact shift was precise, and the resulting box looked like it should.

Ease of Use

The sight also gets high marks for ease of use. The adjustment directions are clearly marked, and they’re easy to see without having to move your head from behind the optic. As I mentioned, you can turn the adjusters with a cartridge rim, which is really handy.

Illumination setting 6 is brilliant red and leaves halos of light floating in your eyes long after you’ve shut your eyelids, but it’s purpose built for very bright conditions and works well for that. The other five daytime settings are more than enough to cover the gamut from near total darkness to bleaching midday sun, and I never found that there wasn’t an adequate setting for the ambient conditions. And as mentioned, there are also settings compatible with night-vision gear.

The MRO SD virtually eliminates any feeling of tunnel vision. You’ll shoot with both eyes open and have a much greater sense of your surroundings. The anodized housing seems to simply disappear, and that’s impressive considering how big the optic is. The objecting lens housing measures almost 1.6 inches in diameter.

The optic alone weighs 4.8 ounces, which is pretty beefy, and with the full co-witness mount it weighed 6.6 ounces. But I happen to like the extra mass. I also like that Trijicon added beefy T20 Torx screws to the base instead of smaller and more common T15s.

Built Strong

This overbuilt design is common on all Trijicon mounting interfaces from scope rings to optic bases. They’re bulky but built to last. And if you already own an MRO base you’re in luck: The MRO SD footprint is compatible with earlier models.

Like other Trijicon products the MRO SD is also built in Wixom, Michigan, if that sort of thing matters to you. It does to many—myself included—and I’m glad to know that this rugged, reliable optic was built about a half-hour down the road from Mack Avenue in Detroit, where Henry Ford rolled out his first road car.

You can expect to pay from $687 up to $1,472 for the optic and 3X magnifier combo. Coyote brown color increases the cost a bit, as does selecting the green dot instead of red. But no matter which of these optics you choose, you won’t be disappointed. Trijicon builds optics for the most demanding critics, so they don’t cut corners. The MRO SD is not, therefore, a “bargain” optic, but considering the quality it’s certainly a great value.

Trijicon MRO SD Specs

• Type: closed-emitter dot sight
• Dot: red or green, 2 m.o.a.
• Objective: 25mm multicoated
• Length/Width/Height: 2.9/1.7/2.1 in.
• Weight: 4.8 oz.
• Adjustments: capless turrets, 1/2 m.o.a. per click; 70 m.o.a. total adjustment
• Battery: CR2032
• Price: $868 (as tested)
• Manufacturer: Trijicon, trijicon.com

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