Charlton Heston's Rifle Now Presumably Free For The Taking

Shotgun! Does anyone know who wrote about visiting a gun show and the NRA convention for Spy? The caption under the photo of Charlton Heston was "Guns 'n Moses." The title of the magazine got everyone they talked to to open right up. To a guy whose idea of humorous magazine writing had been limited to Mad, it was a life-changing article.

[update: I guess it really is a joke that writes itself. ]