I'm not even a political analyst, and I can figure that one out. :)
From the link you provided, narses:
"Defendants named in the suit include MOST MAJOR GUN MANUFACTURERS (emphasis mine), distributors and dealers currently operating the United States, or who export large numbers of guns to the United States."
Again, MOST major gun manufacturers - I'd say it's a no-brainer that Rudy was trying to get the gun manufacturers. (a duh moment. :) )
http://www.nyc.gov/html/om/html/2000a/pr238-00.html