Rail for ghost ring and scope - Evolution Gun Works Picatinny Scope Mount, CVA

I used this rail to mount a ghost ring behind a scope on my muzzleloader. Works like a champ. With scope removed, I shoot 5" groups at 100 yd with the ghost ring. I have a Nikon P series mount for the scope. The rifle returns to the same zero when I replace the scope. NV restricts muzzleloaders to iron sights, while I can use the scope in NE.