Though some fans have expressed their displeasure with the changes that Marc Forster has made in his cinematic adaptation of Max Brooks‘ zombie apocalypse novel World War Z, it seems the movie version is staying faithful to the source material in at least one way: a devotion to chillingly realistic detail. So much so, in fact, that Forster’s Budapest set was recently visited by a real-life SWAT team, who were none too happy with having to confiscate some 85 “prop” firearms that turned out to be fully functional and extremely dangerous weapons. Um, oops. Read more after the jump.

Us Weekly (via Vulture) writes that the SWAT team seized dozens of weapons from the project on Monday, most of which were “automatic, military-style assault rifles.” The production is in hot water because the paperwork accompanying the items claimed they were non-functional props, when in fact they were real guns in working order. “Guns like these are highly illegal to transport even if they were to be used as stage guns, which hopefully they weren’t, said Hajdu Janos and Zsolt Bodnar, director and deputy director of Hungary’s Anti-Terrorism Unit. “The movie company’s employees must have made a mistake bringing the guns in without the Anti-Terrorism Unit’s permission.” Janos and Bodnar’s team are currently interrogating witnesses to find out how exactly the guns ended up inside the country.

A source tells the publication that World War Z is “already over budget and over schedule,” and that Pitt, who is producing the project through his shingle Plan B Entertainment, is “furious.” Pitt also leads the cast, as a UN employee named Gerry Lane who’s racing around the world to stop the spread of the zombie pandemic. Assuming the production can sort out the problem quickly and get back on track soon, the film is scheduled to hit December 21, 2012.

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