Is there any merit / negative in having links to the appropriate Wikipedia pages for the weapons listed? Whilst the individual weapons are listed for each movie, the specific details and history of said items aren't, for obvious reasons.
But, is there a reason there can't be a Wiki link (that opens in a new window, preferably) for each weapon so you could quickly read up the full spec on your favourite firearm when you encounter it on a movie page?
Alternatively and more simply, perhaps just at the bottom of the actual article for each weapon you could have a link, much like Wikipedia do to the IMDB for articles on movies?
e.g.
External Links
Colt Python at Wikipedia
Just a thought...