Ive just done the same for another group, so as background for the rifles and a bit of reading to help work out for yourselves what happened to AIA, here are three links to Stephen Regwell's site. He actively followed them for a few years trying at first to do a test and review for them but... well, read the timeline in the first link and you will see what happened....

The Mystery of Australian International Arms

Australian International Arms - Part 2

AIA Rifles: Cheaply Made