Bearrr264 had a 99C, not a 99A or CD, in 256-3000 that had a rear sight in a dovetail, no extra holes. It is the only 99C that I've ever seen in 250-3000 with the barrel stamped 99C. He made a point to show that to me and was evasive about where he got it. Since it was in a non-cataloged configuration, I figured that it was one of the non-cataloged factory parts guns from when they cleaned out the warehouse during the mid-1980s. Who knows????