That is my guess too. My Optima V2 which was purchased used with the scope mount, is drilled, and tapped for iron sights. It was my understanding the original owner purchased the rifle with the scope mount.
Also, it seems to me i have seen new CVA rifles in stores with scope mounts, that are drilled and tapped for iron sights. If i correctly recall, the sight holes aren't filled with those little plug screws, which i thought was kinda chintzy.