Rather than using the rear sights for range, I figured I'd just do what I do for my AR - Zero it for 300 and then never touch it again. Just choose the aperture size that is most comfortable.
There seemed to be some nice aftermarket rails made by a Chinese company but from what I can tell they never went into actual production. Too bad, they looked nice! I preferred the one that keeps the original silhouette myself. Best thing is they look like drop-in parts, no modification required.