Like a Blaser or on a Blaser? Or specifically what model of rifle do you have?
As someone might be able to point you in the direction of something that will fit.
Most of my rifles are fitted with Picatinny rails. Along with fitting the mounts correctly (pushed forward) and then torqued to the specific setting. Then I have no problem swapping between day and night. Or swapping barrels in my Sauer along with their respective scopes.