There's a lot of entirely US made guns out there.
Kimber, Kahr, Some Sigs, Some Berettas, Springfield 1911s (not the XDs though), Para Ordnance are now made in FLA, Most AR15s are American made (in fact I don't know of an AR import), Rugers are all US made, same with most S&Ws.
I still fail to see the point of buying American Made when you're supporting anti-American labor unions like the UAW.
EDIT
Look here http://www.americansworking.com/guns.html (although thats a pretty incomplete list)