Here is a good site about guns in movies:
http://www.imfdb.org/wiki/Main_Page
Those guys do a good job identifying and pointing anacronisms.
I'm with Alan here. I can't understand producers spending millions with some big breast actres for a couple of romantic scenes instead of having a decent reasearching team to work with militaria and guns. Of course, I'm not talking about movies made until the 70s... that was another story.
It really bothers me.
Douglas.