I wasn't arguing that it SHOULD be. Just that it COULD be.
Also, this thing is a pistol, isn't it? So the concerns that arose from Colt's revolver-rifles aren't an issue here - the cylinder would be forward of the firer's hands and face, always.
My point was, that using "rifle rounds" - the ammunition, not the overall form-factor - isn't really a problem for a revolver mechanism. You just need a heavier, stronger cylinder, is all.