Two Australians who have never fired a gun travel across the United States to investigate one of the country’s most deeply entrenched cultural and political divisions: its relationship with firearms.

Directed by Josh Janssen, the documentary follows Janssen and fellow filmmaker Tommy Jackett on a road trip across America, meeting gun owners, collectors, law-enforcement officers, shooting survivors and academics. Their encounters range from a survivor of the 2017 Las Vegas mass shooting to a former FBI agent, a Texas sheriff and a trauma surgeon who has experienced gun violence firsthand.

Rather than constructing a conventional argument for or against gun ownership, the filmmakers attempt to understand why firearms occupy such a distinctive position in American society.…