I have seen a number of shooters report on the use of reflex sights on doubles. The reports have been favorable.

I have not tried it on a double but have a Trijicon RMR on a S&W Model 41.

Just recently a member posted photos of his Africa hunt with a DR equipped with a reflex sight. I can't find it just now, but maybe he will chime in.

It's not something I would put on a vintage double, but on a modern double it would be marvelous.

Curl