Indeed. The gun in this case is a metaphorical gun. The real object under discussion is a piece of information that was being used as blackmail against one of the characters, and the eventual response to it was a blend of calling their bluff (the blackmailer did not have the proof he claimed to have) and pulling out the bigger gun (a piece of information that was used to blackmail the blackmailer).
Indeed. The gun in this case is a metaphorical gun. The real object under discussion is a piece of information that was being used as blackmail against one of the characters, and the eventual response to it was a blend of calling their bluff (the blackmailer did not have the proof he claimed to have) and pulling out the bigger gun (a piece of information that was used to blackmail the blackmailer).