This was back in 1994 I was in the area and asked about of tour. I was told they don't give factory tours. I guess some journalists might get a tour but it's heavily monitored and controlled for safety reasons and some areas where proprietary processes are used. Basically...if you're not gonna give them a favorable review you won't get in.
When I attended S&W armorer's school in Springfield we were given a factory tour but not everything was shown to us.