desert punk is one of the best i've seen, even though its a fantasy world where they could come up with just about anything they want, they always used real life guns for even all the side characters/henchmen that show up for like one scene
saw FALs, thompsons, a sterling smg, famas, ppsh, BAR, galil, mac 10s, uzis, etc.
the gunfighting probably wasnt realistic in order to be more cinematic, but damn they know their guns