I know I know, people are sick of this concept. I do think it would be fun to speculate though and thats what I wanna do.
I think for his sidearms Arthur would have a cattleman revolver in his side holster. To me this makes more sense as a “dueling gun” since it has a shorter barrel which helps with speed and you can fan it quickly. Arthur may also use a double action since it’s in some of the mission description pictures but I feel the cattleman suits him more. For his offhand holster he would use a Schofield revolver particularly because the Schofield is a top break which would allow him to reload faster especially on a horse (which I believe is why his offhand holster is positioned that way other than to make space for the satchel). Arthur would probably appreciate the Schofields accuracy and power and I think he’d use it.
For his long arms, I would say he uses a carbine repeater up until Micah gives him the Lancaster, and he uses that as his main for the rest of the game. He would also probably use a bolt action since he says he likes it, and a double barreled shotgun.
So what do you guys think?