It's beginning to look like this one will remain a wall hanger. No luck so far on finding a loose barrel or barreled receiver. I'm trying to see what a local barrel maker would charge to replicate this one. It is actually a fairly simple profile. I expect that will end up being too expensive.
On a lark I did e-mail Steyr hoping they might have a company historian or even an employee who might have a source. I'm not holding my breath of that one though.