These are still sold in Europe and included with one AUG package, which I assume is an original factory configuration. You can order them
here and a few other German or Austrian dealers - they're expensive.
It was also possible to order them through an official Steyr importer.
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That is an A2/USR type optic housing. Don't know who makes the optic housing. Like everyone else, I really like that style. Coincidentally the M1/STG77 "skinny" optic housing is nearly identical except for the housing to receiver interface.
The scope tube is high quality, but I don't remember if Swarovski made them or not. @pjssteyraug
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I found your write up on the various AUG sights, over on Bullpup Forum. Very useful, especially the improvised adjustment tool. Thanks.