This introductory chapter lays down the theoretical framework for the forgoing analyses, taking many cues from legal studies, U.S. Supreme Court cases and Foucauldian theory. In the world of the Western, the procedural focus of American law gets in the way of justice. The genre embraces justice by gun violence rather than by trial, and has therefore often been read as ‘anti-law’. From the early dime novel fascination with such outlaws and renegades as Billy the Kid and Jesse James, through depictions of lynching in Owen Wister’s 1902 novel, The Virginian, and the film The Ox-Bow Incident (1943), to the guns-blazing heroics of films such as Rio Bravo (1959), High Noon (1952), and Shane (1953), through the darker critiques of The Gunfighter (1950), The Wild Bunch (1969), and Unforgiven (1992), to the postmodern pastiche of Django Unchained (2012), the Western has nourished a vision of social organisation and a means for delivering justice that operates outside the official parameters of American law, relying on a gunslinging hero to uphold order. This chapter argues, in fact, that this opposition is progressively undone in the genre’s formulaic shootouts. The cherished antipathy between ‘the law’ and the Western’s ‘law of the gun’ is, in short, unfounded.