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 – im Test (PSP) | MANIAC.de
Gun Showdown Q&A - GameSpot
GUN Showdown - PSP - Review | GameZone
GUN Showdown for Sony PSP
PSP - Gun Showdown - LongPlay [4K]🔴 - YouTube
Gun Showdown Review - GameSpot
Gun Showdown (Sony PSP, 2006) - European Version for sale online | eBay