Trijicon RM63 RMR Mount Sealing Plate Review

The Honest Truth About the Trijicon RM63 RMR Mount Sealing Plate

As someone who has spent over a decade pushing gear to its limits in everything from harsh outdoor expeditions to meticulous workshop environments, I’ve learned to appreciate the small components that make a big difference. When I decided to outfit my Glock slide with a Trijicon RMR, I encountered a common scenario where the optic’s footprint exceeded the slide’s dimensions, leaving the battery compartment exposed. This is precisely where the Trijicon RM63 RMR Mount Sealing Plate enters the picture, a seemingly simple piece of hardware designed to bridge that gap and provide crucial protection. I was looking for a robust solution to ensure my RMR remained shielded from the elements, especially after reading about its submersion capabilities. Upon receiving it, my initial impression was of a solid, well-machined component. While I briefly considered a generic gasket or even fabricating a rudimentary seal, the thought of compromising the integrity of a premium optic like the RMR quickly dissuaded me. The immediate feeling was one of quiet confidence, a sense that this small part was doing exactly what it was designed to do, and doing it well.

Real-World Testing: Putting Trijicon RM63 RMR Mount Sealing Plate to the Test

First Use Experience

My first encounter with this sealing plate was during the mounting of a Trijicon RMR onto a custom-milled Glock slide. The process itself was straightforward; after ensuring the slide surface was clean and dry, I simply placed the plate onto the appropriate section of the slide, aligning it with the mounting holes. The plate acted as a perfect interface, filling the void left by the RMR’s wider base and precisely covering the battery compartment. During this initial installation, I felt a satisfying snugness, indicating a good fit without any excessive play. No special tools or techniques were required beyond what’s typically needed for RMR installation, making it an intuitive addition to the process. A minor surprise, though not a defect, was the realization that screws were not included, a detail I’ll elaborate on later.

Extended Use & Reliability

After several months of use, including range sessions and general handling in varied conditions (from dry, dusty ranges to the occasional damp workshop environment), this small but vital component has performed flawlessly. The Trijicon RM63 RMR Mount Sealing Plate has maintained its seal and structural integrity without any noticeable degradation. I’ve deliberately subjected it to conditions that mimic potential exposure, such as wiping down the slide with cleaning solvents and ensuring it sat on a bench where minor splashes could occur. There have been no signs of wear, such as cracking, stiffness, or any degradation in its ability to create a watertight barrier. Maintenance is essentially non-existent; it’s a passive component that requires nothing more than being properly installed. Compared to the uncertainty of using a generic alternative or relying on a RMR without one, this dedicated sealing plate offers a level of reliability that’s hard to overstate.

Breaking Down the Features of Trijicon RM63 RMR Mount Sealing Plate

Specifications

The Trijicon RM63 RMR Mount Sealing Plate is constructed from durable stainless steel, a material chosen for its inherent resistance to corrosion and its robust nature. This isn’t a flimsy piece of stamped metal; it feels substantial. The description notes its ability to protect the RMR in submersion up to 66 feet and prevent leaks for up to 1 hour, which speaks volumes about the material quality and design tolerances. It is designed to be compatible with all Trijicon RMR pistol mounts, ensuring broad applicability for users who opt for this popular optic platform. The attachment type is screw-based, meaning it relies on the RMR’s mounting screws to secure it to the slide and optic. Its finish is a matte black, which complements the aesthetics of most firearm builds without adding unwanted glare.

Performance & Functionality

The primary function of this plate is to provide a waterproof and dustproof seal for the Trijicon RMR, specifically over its battery compartment and mounting surface. In this regard, it performs exceptionally well. When properly installed with the RMR, it creates a reliable barrier against environmental ingress. I haven’t personally tested its 66-foot submersion limit, but the confidence it instills during regular use, knowing it will handle rain, sweat, and accidental dips without issue, is significant. Its performance is essentially a “set it and forget it” situation – once installed, it does its job silently and effectively, contributing to the overall reliability of the optic system.

Design & Ergonomics

From a design perspective, the RM63 is elegantly simple. It’s a precisely cut piece of metal, shaped to perfectly contour the underside of the RMR and the corresponding area of the pistol slide. The matte black finish is understated and functional, blending seamlessly with the optic and firearm. There are no sharp edges or uncomfortable protrusions; it’s designed to be a seamless interface. The ergonomics of this plate are entirely dependent on the RMR itself once mounted; the plate itself doesn’t have “ergonomics” in the traditional sense but contributes to the overall feel by ensuring a stable and sealed mount.

Durability & Maintenance

The stainless steel construction inherently provides excellent durability for this type of component. It’s designed to withstand the rigors of firearm use and exposure to cleaning agents. I haven’t observed any signs of wear or damage, suggesting it will last for the lifespan of the optic or longer. Maintenance is minimal to non-existent. The best practice is to clean it when you clean your RMR and slide, ensuring no debris interferes with the seal during reinstallation. There are no specific maintenance tips beyond ensuring it’s clean and correctly seated before tightening the RMR screws.

Accessories and Customization Options

The Trijicon RM63 RMR Mount Sealing Plate itself does not come with any accessories, nor does it have customization options in the traditional sense. Its purpose is singular: to provide a seal. However, its compatibility with all Trijicon RMR pistol mounts means it integrates perfectly with the standard RMR mounting screws. The key consideration here is that screws are often sold separately or may need to be sourced by the end-user if they are not part of the RMR package or the firearm’s mounting solution. This is a crucial point for anyone purchasing this plate, as it is not a standalone, ready-to-go item without the necessary fasteners.

Pros and Cons of Trijicon RM63 RMR Mount Sealing Plate

Who Should Buy Trijicon RM63 RMR Mount Sealing Plate?

This sealing plate is an absolute necessity for anyone mounting a Trijicon RMR on a pistol slide where the optic’s footprint is wider than the slide itself, particularly on platforms like many Glock MOS configurations. It’s ideal for firearms enthusiasts who prioritize protecting their optics from water, dust, and debris, whether for concealed carry, duty use, or competitive shooting where reliability in all conditions is paramount. If you are the type of user who values a truly sealed optic system and wants to avoid potential water ingress into the battery compartment, this component is a must-have.

However, individuals mounting an RMR on a slide milled to perfectly match the RMR’s footprint, or those who never anticipate their firearm encountering water or significant dust, might find it less critical, though still highly recommended for complete protection. For those needing a perfectly sealed optic setup, I would also strongly recommend ensuring you have the correct length RMR mounting screws readily available, as they are crucial for proper installation.

Conclusion on Trijicon RM63 RMR Mount Sealing Plate

The Trijicon RM63 RMR Mount Sealing Plate is a small but fundamentally important piece of kit for anyone integrating a Trijicon RMR onto their firearm. Its stainless steel construction and precise design deliver on its promise of superior environmental sealing, offering a level of protection that is simply unavailable without it. While the fact that it doesn’t include mounting screws is a notable inconvenience and adds to the overall cost, the peace of mind it provides in safeguarding a valuable optic against water and dust is undeniable. For its intended purpose, it performs impeccably and represents a worthwhile investment for those who demand maximum reliability from their equipment. If you’re outfitting an RMR, this plate isn’t an optional accessory; it’s a crucial component that ensures your optic performs as intended, no matter the conditions.