I'm pretty happy with the Vortex 2-7x that I found. You aren't going to find really high magnification in an EER scout scope. If that is the requirement, drilling and tapping for proper bases is in order. Unless it is a very rare variant in excellent shape, well done D&T shouldn't affect value much. The other option is to clone a period sniper rifle which typically had side mounts, but they aren't real cheap.