I think this is possibly the best set up for a lever gun. It comes with the ghost ring sights in case your optics fail and has the versatility of mounting virtually any type of scope you can imagine. The only downfall I can see is that the rear ghost ring aperture has to be removed if you plan to use a standard eye relief scope. A few scope makers have Intermediate Eye Relief (IER) "scout" type scopes that allow forward mounting above the barrel and with this type or a red dot type you can leave the rear aperture attached. The only question I would have is if they offer it for the 308xlr. I think that is virtually a 336 but chambered for the 308 marlin round. If this is the case, the model for the 336 may fit.

http://www.xssights.com/store/scope.html