Looks like a prop or show piece of some type to me. The barrel doesn't appear to line up with the chambers, but instead lines up with the middle of the cylinder. Cylinder doesn't look right, either, sort of cap-and-ball-but-not-quite. Hammer looks off, too.
The pic was originally posted 2009 or before. I traced it back that far from the embedded coding and lost interest. The barrel seems to line up with the centerline of the cylinder. Something doesn't add up.