Trijicon rmr for carry pistol...does exactly what it is supposed to do. - Trijicon ACOG Mount RMR Adjustable Red Dot Sight w/ MOA Dot Reticle

The Trijicon RMR does exactly what it should, when used as an optic on a carry pistol. It is rugged, simple to use, and holds zero even after some fairly abusive behavior. (Used in a high-round, high-intensity advanced pistol class.)

It IS still an optic, so mist/rain can create fogging and emitter-blurring issues, but that is expected. The dot itself (when dry) is clear, bright, and works well.