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Onscreen credits for producers John Heyman and Norman Priggen read: "Produced by John Heyman and Norman Priggen for Champion Production Company." Location shooting for the film took place in Los Angeles with additional shooting at Paramount Studios. According to a January 5, 1972 Hollywood Reporter article, British director Robert Hartford-Davis originally conceived of the story for the film based on the black power movement in contemporary Britain and hired Robert Shearer to write the screenplay. The film's copyright holders, World Film Services, Ltd., a London-based company headed by producer John Heyman, and World Arts Media Film Productions Associates (UK) Ltd., apparently owned the rights to the story and, according to some news items, were involved in financing the film, but neither company was listed onscreen.
Black Gunn was the first American feature-length film for Hartford-Davis and marked the film debuts of American baseball star Vida Blue and NFL football player Gene Washington. Although a July 31, 1972 Hollywood Reporter news item announced that Heyman was considering a sequel to Black Gunn, the sequel was never made.