Trijicon SRO Review

In this guide, we'll explore the Trijicon SRO, the large window version of the Trijicon RMR design back in 2019. Since its release, many have been eager to see if this red dot sight addresses the main issue for pistol shooters: easily spotting the dot in the window.

The SRO has been tested on different rifles and pistols. Many competitors choose the Trijicon SRO to have an advantage in stages.

Here are the pros and cons of the Trijicon SRO.

Trijicon SRO Dimensions & Specs

  • Magnification - 1X
  • Dot Sizes - 1, 2.5 or 5 MOA sold separately 
  • Weight - 1.6 oz
  • Length - 2.2"
  • Width - 1.3"
  • Height - 1.4"
  • Body - 7075 T6 Forged Aluminum
  • Reticle color - Red
  • Adjustment - 1 MOA / Click
  • Brightness Lockout Mode - Yes
  • Battery - 1 CR2032


  • Enlarged Window for Easier Dot Tracking: The product features an enlarged window, which enhances the ease of tracking the dot or reticle.
  • Same RMR Mount Footprint: This product maintains the same mount footprint as the RMR (presumably another optic or sight), ensuring compatibility with existing mounting solutions.
  • Top Battery Access without Sight Removal: The design allows for easy battery replacement without the need to remove the sight. Battery access is conveniently located at the top of the unit.
  • 5 MOA Option for Best Dot Clarity: The 5 MOA (Minute of Angle) option is recommended for optimal dot clarity. This reticle size provides a clear and precise aiming point.
  • Solid Build Quality: The product boasts a robust and durable construction, ensuring reliable performance and longevity.


  • Overhang Can Block Shell Ejection: It's worth noting that the larger lens window might have potential ejection issues with certain pistol slides, particularly those with an ejection port. The overhang could potentially lead to jamming or interference.
  • Elevation and Windage Adjustments Feedback: Some users have reported that the elevation and windage adjustments lack a distinct and positive click feedback, which could impact the precision of adjustments.
  • Lens Hood Limitation: The lens hood of the product might not be rated for heavy-duty use like the RMR. It may not be designed to withstand significant impact on the frame, which could affect its durability and performance in demanding conditions.

Trijicon SRO Core Features 

Trijicon SRO Window Size

The main standout feature of the Trijicon SRO, a Specialized Reflex Optic, is its large circular window size. After using this optic for over 2 years, the most remarkable aspect of this optic is that the top portion of the window is slightly larger than normal that helps the shooter retain the dot after follow up shots.

Normally, the shooter would lose the dot on a smaller window right on the edge either left, right or the top.

Although the window size is definitely helpful, I've still observed that tracking the dot can become challenging if my grip on the handgun isn't right. This indicates that more practice and getting consistency are still necessary.

For many pistol shooters, enhancing their red dot tracking and skillful aiming is a journey that involves experimentation and dedicated practice, with some facing more challenges than others. Some shooters mistakenly think that a larger window size completely eliminates parallax issues.

While a larger window can reduce the effects of parallax to some extent, it's not a guarantee that parallax is entirely eliminated. Proper technique and understanding of parallax are still crucial for accurate shooting.

Most often, the challenge arises from the slight misalignment of the shooter's position relative to the sight. This tiny discrepancy causes the dot to slip beyond the window frame's periphery.

With diligent practice, marksmen can adeptly acquire the target using the SRO, although consistent practice remains imperative.

Thanks to the SRO's expansive viewing window, effortlessly zeroing in on the red dot reticle during the draw becomes a seamless feat, requiring no additional training.


The entire optic is made with 7075 T6 aluminum just like the RMR. The circular lens frame may not be as durable as the square rounded edge as the RMR, where it can divert impact stress. This is why some people say it's not made for duty use. However, that's assume the optic is constantly getting dropped and slammed against objects every time the shooter uses it, which isn't very practical.

While a larger window might be beneficial for some situations, such as competition shooting, it might not be the best choice for tactical or concealed carry applications where a smaller, more compact sight might be preferred.

The weight of the SRO is 0.4 oz heavier than the Trijicon RMR. Some argue that it adds more weight to the firearm, but some think it's still light enough and they don't even notice the subtle extra 0.4 oz.

Same RMR Mounting Footprint

The Trijicon SRO shares the RMR mounting platform, meaning it can be easily mounted on a handgun slide with an RMR cut. The transition from RMR to SRO is seamless as the same adapter plates and setup used for the RMR can be seamlessly applied to the SRO.

This eliminates the need for a completely new mounting system.

Moreover, the SRO offers versatility by being compatible with various mounts for rifle applications, basically the same mount used for RMR. This expands its usability beyond handguns and onto rifles for diverse shooting needs.

Reticle Options

Our testing favors that the Trijicon SRO with a 5 MOA dot is optimal for pistol applications. The dot size is sufficiently large for easy visibility, and it effectively reduces starburst effects for individuals with astigmatism.

Conversely, the 1 MOA dot is better suited for rifle uses to get a much more refined aim, or serve as an offset red dot.


The SRO functions as a parallax-free optic at significant distances. However, a minor parallax shift can still occur when the target plane is at close range. 

For the most part, the parallax is unnoticeable especially when shooting on the move. Above all, no red dot sight is 100% parallax free.

Brightness Setting

The "Locked Out" mode allows the device, likely an SRO (Sight-Ready Optic), to utilize its auto-brightness feature. This feature enables the optic to sense the surrounding ambient light conditions and automatically adjust the dot's brightness to an appropriate level.

When in "Locked Out" mode, you have the ability to engage the auto-brightness adjustment solely until you decide to unlock it. Conversely, the "Lock In" mode serves an alternative purpose. If you prefer to keep your SRO's brightness fixed at a specific level, like brightness level 6, and avoid interference from accidental button presses or auto-brightness adjustments, you can utilize the "Lock In" mode.

This mode ensures that the brightness setting remains locked at your chosen level, guaranteeing a consistent brightness level (such as level 6 in this case). Similar to the RMR (likely another optic product), these two brightness settings and the newly introduced operation modes can be conveniently controlled using easy-to-use buttons located on the side of the device.

Battery Access

The Trijicon SRO boasts a battery life of approximately three years, utilizing just one CR2032 battery. What sets it apart is its innovative battery-loading design located at the top, eliminating the need to dismount the sight, which is unlike the RMR.

Apart from the expanded viewing area, a significant feature is the top-loading battery design, similar to the Leupold Delta Point. This design eradicates the need to detach the sight for battery replacement.

Previously, I used to dislike changing the battery due to the requirement of locating tools for sight removal. This fresh design completely solves that issue, and there's no need for re-zeroing.

Final Verdict

The Trijicon SRO's large window makes it a top-tier open reflex red dot sight like the Leupold DeltaPoint Pro, especially appealing to competition shooters and range enthusiasts. Its large window design, RMR mount compatibility, and top battery access make it a standout choice.

Some shooters believe that a larger window size negates the need for training and practice. They assume that the larger sight picture will compensate for lack of practice. However, consistent training remains essential for maintaining shooting skills and accuracy, regardless of the window size.

However, potential buyers should be aware of its limitations, especially concerning the lens hood's durability. For those seeking a large window pistol optic, the Trijicon SRO is a prime choice. 

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