I have a scout scope mount on my Norc, the type that replaces the handguard with a pic rail. They're made by Amega Range and Ultimak (honestly don't recall which mine is), as well as by M14.ca. They don't block the sights, and allow the instant removal of the scope...but it has to be a scout scope or handgun scope. I love the set-up, other folks don't, YMMV. I rarely take the scope off, although I might do it more often if I ever replace the fairly crappy rear sight on my Norc with a GI version.