Gun Showdown on PSP came out 4 years before RDR1, and it also nails the cowboy vibe, with such a small open world and janky controls. : r/reddeadredemption
Gun Showdown Sony PSP Gameplay - Quickplay Shooting - YouTube
Gun Showdown Review - GameSpot
Gun Gameplay Movie 3 for PC - Metacritic
PSP - Gun Showdown - LongPlay [4K]🔴 - YouTube
Gun Showdown PPSSPP Gameplay Full HD / 60FPS - YouTube