The movie is most likely a parody of the traditional international spy movies a la James Bond, starring a non-traditional Melissa McCarthy. The heavy dosage of guns in this poster signals exactly that: traditional poses with guns from traditional spy movies to make fun of them via the action pose by the heavy set funny McCarthy, as well as the stupid traditional gun poses by Jude Law, Jason Stathem and Rose Byrne. This is a clever use of guns on a movie's poster for comedic effect, and not just a lame attempt to boost ratings with nonsense macho gun images. Spy just might be silly fun.
