This picture made me chuckle – and wince. It shows Capt. Cool demonstrating one of the worst ways to carry a SxS shotgun. And it looks like a nice SxS gun with a rounded action.
When you open a SxS and rest the barrels on your shoulder like this, all the weight of action and stock bounces on the hinge pin (the pivot-point in the action that the “hook” at the front of the forward lump rides on).
With every step you take, this bouncing wears on that pin. It will soon wear it out and make the gun go “off the face”, meaning the barrels will no longer mount properly against the face of the action.
On most guns, “off the face” is a fixable problem. But doing it right is not cheap, and finding a guy who can do it right isn’t easy.