Jackserv, I'm almost certain that the barrel has been cut, for 3 reasons. First, IIRC the shortest standard length was 3in. Second, the sight is the wrong shape - more of a half-egg than a semicircle. Third, and perhaps most importantly, the sight isn't pinned in place. If you look at the barrel in the OP's pictures, you'll see a little nub centered beneath the sight; this is the retaining pin.
I think a past owner had the barrel professionally cut to enhance concealment or to mitigate a bulge caused by firing a live round behind a squib, ie a bullet stuck in the barrel from a defective round. A gunsmith recrowned the muzzle and brazed on a new front sight. He did a decent job, by the looks of things.
The bad news is that this work wipes out any collector value the gun had. The good news is that you can refinish it without guilt since the collector value is already gone.