I simply prefer to remove sights on anything I scope. With this pic for instance, although it's dark if you look at where my hand is holding the barrel you will notice no rear sight despite having room for one. That rifle has no sights mounted. My wife's Wolverine 209 (no pic) also has sights removed and scope mounted.

If your going to scope it and it's legal to use scoped during muzzleloader season, there's no sense going halfway about it. Either scope it and remove the sights or don't scope it and use em.