Gun Running, an expansion for Grand Theft Auto V Online, immerses players in the lucrative yet dangerous arms trade. As CEOs, players can establish and operate underground bunkers to research and manufacture weapons for illegal distribution. The expansion introduces a variety of military-grade vehicles and weaponry, allowing players to not only profit from the arms trade but also defend their operations against rival criminal organizations. Gun Running adds a strategic layer to the online multiplayer experience, emphasizing resource management and tactical decision-making as players navigate the cutthroat world of illicit weapons trafficking in the sun-soaked city of Los Santos.