Players can wield a revolver and switch between rifles, shotguns, various explosives, and bows. Players can enter a first person quick draw mode during gameplay. As the player progresses through the game, they can choose to complete side missions, including poker tournaments, cattle herding, law enforcement, time trials and bounty hunting. Once the patience meter reaches zero, a showdown ensues between the player and the locals. A Town Patience meter goes down every time a civilian is killed. They act as gunslingers protecting righteousness or seek reputation as they face resistance fighters, local lawmen, renegade soldiers and vengeful Apaches and Blackfoot. The player can also cause mayhem within communities, but can attract attention from lawmakers and other gunslingers by doing so.

Players can hunt and kill various animals like buffalo, wild horses, and even stray dogs and farm animals. While traveling from town to town, bandit attacks are frequent and players must either escape or defend themselves.

Players can purchase upgrades using money obtained from these optional activities and by mining gold veins. Players control the protagonist, Colton White, from a third-person perspective. Gun features an action role-playing game environment, including side-missions that add to the story. Gunfights are an important feature of the game, with enemies ranging from outlaws to wild animals.

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