48.Gun
My hint = (facepalm). There was a game before RDR that had "quickdraw", a western themed open world to explore, a cowboy's trusty horse, weapons of the time, cool gunslinger story, gamblin' house for casino minigames, hunting criminals for rewards, awesome ambient challenges, etc. That game was Gun. And to this day, I still consider it the best wild west game to ever release. Seriously...Play gun, or else I'll shoot you!!!