Not sure if that peep dovetail sight is SASS legal, however, you might want to look at a full buckhorn, which is slightly open at the top of the ring. If you ignore the little sight notch at the bottom, or file it out, you get almost as good a sight picture as a full ghost ring. So far as ghost ring sights not being fast, the best sight I've ever encountered was the apature rear and the square post front sight on an M-1 Garand. Granted, this is a receiver sight, but the optical effect is the same. (With a dot of white automobile paint on the rear of the front post square projection, such an arrangement is very fast to acquire and line up...especially in low light conditions.