(My Krag inexperience is showing here...)

I have learned recently that sporterized Krags have used
either the Redfield or Pacific peep sights that attach to the
LH side of the receiver. Do both of these require the removal
of the cut-off switch? Or is there a peep sight that doesn't?
Is there any on-line reference source to find out more info,
perhaps starting with make/models of the different sights?

Any info you wish to share would be greatly appreciated.
                                                         Thank you!
                                                           -Mark-