You will ask, 'LibKill, whatinhell is a 'ThunderZot'?
That is a very good question and deserves a set of specifications.
1. It must stop a hostile in his tracks with one well-placed shot.
2. It must be small enough for concealed carry. By that I mean that it should fit in the average jeans pocket without raising alarms.
3. Add options that you think would be desireable.
Try the Magnum Research "Lone Eagle" in .308. It seems to fit your parameters.