Trijicon RCR: There's such a thing as too low on an optic deck height

Published on August 7, 2025
Duration: 1:10

This video explains that the perceived larger window size on optics like the Trijicon RMR HD and RCR is not due to a larger actual window, but rather a slightly taller optic deck height. This increased height allows the optic to clear iron sights more effectively, improving the sight picture without the irons obstructing the view.

Quick Summary

The perceived larger window size on optics like the Trijicon RCR and RMR HD is primarily due to their taller optic deck height, not an intrinsically larger window. This increased height allows the optic to clear iron sights more effectively, resulting in a better sight picture with less obstruction.

Chapters

  1. 00:00Window Size Differences
  2. 00:09Why Reviewers Claim Larger Windows
  3. 00:29The Role of Optic Deck Height
  4. 00:35RMR HD and RCR Design
  5. 00:47Clearing Iron Sights
  6. 00:56Conclusion on Window Size

Frequently Asked Questions

Why do some optics like the Trijicon RCR and RMR HD seem to have larger windows?

The perceived larger window size is not due to a bigger actual window, but rather a taller optic deck height. This increased height allows the optic to sit higher, providing better clearance over iron sights and thus a clearer sight picture.

What is the advantage of a taller optic deck height on a red dot sight?

A taller optic deck height, like on the Trijicon RCR and RMR HD, primarily benefits by improving clearance over the firearm's iron sights. This reduces obstruction, leading to a cleaner and more usable sight picture, especially when the irons are still present.

How does the Trijicon RMR HD differ in its optic mounting?

The Trijicon RMR HD is noted for its optic deck being more prominently raised and slightly canted forward. This design choice contributes to its sight picture and how it interacts with the firearm's iron sights.

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