I always found the No.4 looking model a little amusing considering Lithgow never made No.4 rifles. It just feels like a more appropriate retro-look would have been with a SMLE-style front end, either with the Mk. III open sights like the Ishapore 2A1s or the peep sights like the Mk. V
They (AIA) originally wanted to build new Enfield No.4 type rifles first for the local and then international market place from NOS No.4 parts sourced from places like Pakistan and others etc. as they thought this was a better/stronger design for the higher powered .308 Win ammo they would be chambered in and Lithgow had already stopped making SMLE's decades ago so they had no ready supply of NOS SMLE parts, plus the Australian Government had sold off all their spare SMLE parts and remaining rifles in the mid 1990's to a gun dealer (John Jovino Co.) in New York, USA.
AIA should be commended for taking on this task, but as often happens they could not make a go of it in the international market and over extended themselves financially and had to pull back to Australia to concentrate on the local market. There is talk they may one day again start making rifles in volume and start exporting again but who knows.
All I know is that the AIA rifles I have and had have all shot really well, have been well put together and have never suffered a broken part or let me down, In all the years they have been in use in both Australia and Canada I have never heard of owners complaining about poor quality or breaking parts.