Observations other than the watch:
Note the gas discharge the the right of the barrel. The barrel must have been ported to reduce recoil.
Note the shiny object at the muzzle of the top barrel. What is it? It is a bore reducing sleeve? If so it must have been ported just like the barrel.
No, it is probably not his gun. It was probably a fixture at Camp David, unless it was just a prop for the photo shoot.
Many have noted there is no apparent recoil.
Many have noted that he does not appear to be looking down the barrel.
Yep, the photo is revealing of Obozo.
Most of that has already been noted but what I’m not seeing is the back fence. The skeet range at Camp David is circular and goes from house to house. If he’s on station either that wall or the High House should be to his right. the background in this picture is not from the skeet range at Camp David.
Google shows the fence to still be there.