Have you heard of "Red Dead Revolver"? That's the game Gun knocked off. And this game, Red Dead Redemption, is a sequel to Red Dead Revolver. SOOO, I think it's fair to say this game isn't "knocking off" Gun. Rock Star came up with the concept first. And Gun, knocks off the first one... which Activision will most likely do again with this second one.(Just my opinion)