It's not a "mistake". The movie is a work of FICTION, not a documentary, and even if it was, productions have much more complex details to worry about than presenting historically "perfect" props. In fact, they may not even be able to AFFORD authentic props - so what'da gonna do?
Unless the producers put a big disclaimer on their movie that says "the most authentic weapons ever presented", (and none ever have or will), then don't expect it.
Relax, and enjoy the movie.
NOTE: Even though I have a separate post requesting that posts like this not be designated at movie "goofs" and asking that they be placed as message board comments, that does not then negate my opportunity to respond as I wish to above mentioned comments...
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