Townhouse Tavern. Last week, Borderstan reported that Townhouse Tavern, the dive bar off of 17th Street on R Street NW, had been raided by the FBI and a shotgun had been seized. Details were scant of why and what had happened following the FBI raid. Now, TBD seems to have the full story, but boy is it complicated. Some background: Townhouse Tavern has a bit of an unsavory reputation. The dive bar apparently used…