In the first picture he is carrying a double barreled shotgun, and the pistol in his holster looks like a Schofield.

In the second picture, he has a Schofield.

First gun it's a Coachgun and the second one it's a Schofield

First one double barreled shot gun

Second one cattlemen revolver is my guess

Cuz when the game starts we dont get other revolvers only sawed off shotgun and cattelmen revlover so thts my guess