I appears to be a standard weight barrel that has been shortened and the rear sight boss turned off. Definitely not a featherweight barrel. I have seen this kind of barrel work done several times over the years. I myself had the rear sight boss turned off and front sight removed on a 264 barrel.
Perhaps, but if that's the case whoever did the work was a master at his craft. His wood work was a little rougher though judging from the inletting, although not altogether bad.