Found this on opencarry. It might be of interest to some.
http://opencarry.mywowbb.com/forum4/3980.htmlJeffrey Raynor (Virginia) He was charged with carrying a concealed pistol and possessing a firearm on a military installation. Neither charge was supported by the statutory language. The governmentâ€™s evidence was that the grip, hammer, and the back part of the slide were visible and that it was immediately recognizable as a pistol. The evidence also showed that he was traveling in a motor vehicle on a road and was not in â€œa building or part thereof owned or leased by the Federal Government....â€ He was found not guilty of both charges according to defense counselâ€™s letter of April 17, 2006.