I have a right handed friend that that has an 'iffy' right eye and has to do acrobatics over the stock to use his left eye in the scope.

For diopter we have these :-
https://www.intershoot.co.uk/acatalo...m-597-260.html
https://www.intershoot.co.uk/acatalo...Swap-1140.html

But what is available for scoped rifles?

Thanks.