The Lithgow F90 is the standard service rifle for the Australian military. It is based on the Steyer Aug design and is often dubbed the "Aus Steyer". I got a chance to check out two F90s at Big 3 East Media event.
You can see a clip of the F90 here.
The Lithgow F90 can be fed with Steyer Aug magazines. However these were fed excuvsively with Magpul PMAGs made for an Australian Military contract.
Image may be NSFW.
Clik here to view.
The PMAG 30 AUS GEN M3 Window is a 30-round 5.56x45 NATO polymer magazine for Steyr® AUG/F88/F90 compatible weapons that features transparent windows to allow rapid visual identification of approximate number of rounds remaining.
