Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer Review

The Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer: First Use to Final Thoughts

When it comes to reliable aiming solutions, particularly for firearms that demand speed and precision, Aimpoint has long been a name synonymous with quality. My own journey into optics started with a simple desire to improve my accuracy and target acquisition speed, and over the years, that has led me to explore various mounting solutions. The Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer isn’t a flashy piece of gear, but it’s one that, in my experience, is absolutely critical for achieving an optimal sight picture on specific rifle platforms. I found myself needing this spacer after trying to mount an Aimpoint Micro T-2 without one on an AR-15; the optic sat far too low, making it uncomfortable and slow to acquire a sight picture. I briefly considered fabricating a shim myself or looking for a cheaper, generic riser, but ultimately, the allure of Aimpoint’s own precision-engineered accessories won out. My initial impression upon unboxing this spacer was one of solid, no-nonsense craftsmanship. It felt substantial, perfectly machined, and ready to integrate seamlessly with my existing Aimpoint optic.

First Use Experience

My testing grounds for this particular spacer have been primarily the range and the workbench of my personal AR-15 build. The initial mounting was incredibly straightforward, fitting snugly between the Aimpoint Micro optic and its standard mount. I tested it by performing rapid target transitions at 25 yards, focusing on how quickly I could acquire the red dot after shouldering the rifle. In terms of performance, this optic spacer excelled in maintaining a consistent sight picture across repeated firing drills, even when subjected to the vibrations of standard 5.56 NATO rounds. There were no surprises or quirks; it simply did exactly what it was designed to do, which was a welcome change of pace.

Extended Use & Reliability

After several months of consistent use, including trips to the range and periods where the rifle was stored in its case, the Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer has held up remarkably well. There are absolutely no signs of wear and tear, such as cracks, looseness, or degradation in its finish. Cleaning it is as simple as wiping it down with a soft cloth, and it requires no special maintenance beyond ensuring it’s properly secured during optic mounting. Compared to the less robust risers I’ve encountered from other brands, this Aimpoint spacer demonstrates a superior level of durability and precision, justifying its premium nature.

Breaking Down the Features of Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer

Specifications

This Aimpoint spacer is constructed from aluminum, a material chosen for its strength and light weight, ensuring it won’t add unnecessary bulk to your firearm. Its primary function is to raise the optical axis of compatible Aimpoint sights to a 39 mm height. This specific height is crucial for achieving a co-witness with standard AR-15 iron sights, allowing for a natural and efficient aiming experience. It is designed to fit a range of Aimpoint’s popular micro red dot sights, including the Micro T-1, T-2, H-1, H-2, as well as the CompM5, M5s, and M5b models. The STS (See Through Spacer) footprint means it integrates seamlessly with Aimpoint’s proprietary mounting systems.

The 39 mm optical axis height is a critical specification, as it dictates the final sight plane relative to the firearm’s rail. For many shooters, this height is the sweet spot for comfortable and rapid target acquisition when using a carbine-style rifle, especially when paired with flip-up iron sights. Unlike generic risers that might offer a variety of heights or require additional hardware, this spacer is purpose-built for a specific and highly desirable sight plane. Its black anodized finish provides a durable and non-reflective surface, blending in with the aesthetic of most firearms.

Performance & Functionality

The core function of the Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer is to provide that precise elevation for your optic, and it performs this duty flawlessly. By raising the optical axis to 39mm, it allows for perfect absolute co-witness with most AR-15 iron sights, meaning the red dot sits directly above the front sight post when viewed through the optic. This significantly speeds up target engagement, as you don’t have to adjust your head position to look through the sight. For me, this meant faster follow-up shots and a more intuitive feel when transitioning between close-quarters and medium-range targets. It truly elevates the usability of the Aimpoint Micro and CompM5 series optics on platforms where the stock mount is too low.

The effectiveness of this spacer lies in its precise engineering. It ensures that your red dot sight is not just mounted, but correctly mounted for optimal performance. Any deviation from the ideal height can lead to neck strain, slower target acquisition, or an inability to properly use backup sights. This Aimpoint accessory eliminates those potential pitfalls, making the entire aiming system more cohesive and effective. It’s a simple solution to a common problem that many firearm owners face.

Design & Ergonomics

The design of the Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer is as functional as it is minimalist. It’s essentially a solid block of aluminum with precise cutouts to mate with both the optic and the mount. The black anodized finish is typical Aimpoint quality – durable, matte, and resistant to scratches and abrasions. There are no sharp edges or unnecessary protrusions; its form follows its function perfectly.

Ergonomically, the spacer contributes to a more comfortable shooting posture. By bringing the optic to that 39mm height, it reduces the need to dramatically crane your neck or adjust your grip to align your eye with the sight. This can lead to less fatigue during extended shooting sessions and a more consistent cheek weld. The integration with Aimpoint’s mounting system is seamless, providing a secure and rigid platform.

Durability & Maintenance

As mentioned, the aluminum construction and black anodized finish make this spacer exceptionally durable for its intended use. It’s designed to withstand the rigors of firearm use, including recoil, impacts, and environmental exposure. I’ve had mine mounted on a rifle that’s seen frequent use and storage, and there’s no indication of wear.

Maintenance is virtually non-existent. A simple wipe-down with a cloth is all that’s needed to keep it clean. The only real care required is ensuring it’s mounted correctly with the optic and its respective mount, using the proper torque specifications to avoid damaging the threads or the components. Given its solid construction, I anticipate this spacer will last as long as the optic it supports, which is to say, a very long time.

Accessories and Customization Options

The Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer is, in essence, an accessory itself. It doesn’t come with additional accessories, nor does it offer traditional customization options like different colors or materials beyond the standard black. Its purpose is singular: to provide a specific height increase for compatible Aimpoint optics. However, its true accessory is the iron sight system it enables co-witnessing with. Many users pair this spacer with flip-up sights like the Troy folding sights or Magpul MBUS to create a versatile and robust backup sighting solution. It is also designed to work with Aimpoint’s own quick-detach mounts, offering flexibility in how the optic is attached to the firearm.

Pros and Cons of Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer

Who Should Buy Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer?

This optic spacer is ideally suited for AR-15 owners who are using Aimpoint Micro T-1, T-2, H-1, H-2, CompM5, M5s, or M5b red dot sights and want to achieve absolute co-witness with their iron sights. It’s perfect for shooters who prioritize a comfortable and efficient shooting platform for competition, defensive carbine use, or general range enjoyment. If you’ve mounted a Micro series Aimpoint and found it sits too low for comfortable use with backup sights, this spacer is likely the solution you’re looking for.

Anyone who doesn’t plan to use iron sights, or who already has a red dot mount that achieves their desired height, should probably skip this spacer. Additionally, those on a very strict budget might find alternative, though often less precise, riser solutions. For those looking for the most robust and perfectly aligned solution for their Aimpoint optic on an AR-15, consider pairing this spacer with flip-up iron sights from reputable brands like Magpul or Troy for a complete, highly functional aiming system.

Conclusion on Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer

The Aimpoint Micro & CompM5 39mm Red Dot Sight Spacer is a testament to the fact that sometimes, the smallest components make the biggest difference. It’s a simple, elegant solution that elevates the performance and usability of already excellent Aimpoint optics on the AR-15 platform. While its price point might seem high for what is essentially a metal block, the precision engineering, perfect fit, and contribution to an optimal sight picture make it a worthwhile investment for those who value accuracy and efficiency. For shooters seeking that perfect co-witness height with their Aimpoint Micro or CompM5 sights and iron sights, this spacer is an unreservedly recommended addition to their firearm. It delivers exactly what it promises, embodying the high standards that Aimpoint has set for itself in the optics industry.