Though it could easily be. No, this is "mere" cosplay, Ben Van Dyken giving it 1001% with his John Marston costume, getting not only the threads right, but the dirty dirt and even the locale for the photo shoot.
These shots in the gallery to your left are just the start; Van Dyken has also stabbed a sasquatch and re-enacted the game's iconic cover shot, which you can see at his full gallery, linked below.
If only we could hear him whistling as he rode over a mesa at sunset, pistol in hand, dead crows at his feet...
Western adventure game Red Dead Redemption was released on the Xbox and PS3 earlier this year. It's safe to say it was one of the best things to happen to 2010.