So I might get some hate on this, but has anyone mounted a red dot somehow on a German style claw mount double rifle?
I was closely involved in this.
My friend had combination gun rifle/shotgun OU with German claw mount scope system.
He bought a separate red dot.
We took it to gunsmith. (because local gunsmith is my friend, so to make it easy with proper introduction)
Gunsmith installed
It worked,
It was accurate.
(accurate, elegant, easily removable, user friendly, kept zero)
No issues.
If I remember correctly (although I might be wrong) he did also bought some fittings for this mount in the shop mentioning to shop keeper it will be installed on claw mounts.
Picatinny rail can work, as per above picture. But this in my example was with direct claw system, and more elegant.
To each, his own, but I think picatinny rail is for modern rifles with closed bridge over action. Steyer, tikka and similar.
For classics, like break action or bolt action open top rifles, picatinny is NOT good taste.