Don't know if it's my favorite, but I caught the end of Enemy of the State the other day. It was nice to see something realistic in the midst of some of the shows you see these days - the dramatic racking the slide of the pistol or shotgun for effect, and always at the wrong time (they've been carrying it around for days with nothing in the chamber?).
Anyway, Jon Voight requests a 'piece' from his minions, and when they give it to him, he basically does a check of the chamber to verify a round is in there. No need to cycle the action!
I like the Resident Evil Movies. I don't know if it is the guns or Milla Jovovich that I like most. Starship Troopers has a stupid plot, but some great