Lithgow Small Arms Factory made a handful of rifles almost identical to that in 1955, for the Royal Australian Air Force. Here's a link: www.awm.gov.au/collection/REL:19494
There had been a few earlier versions of shortened, lightened rifles based on the No 1 Mk III/III* made at LSAF before that, during WWII, intended for jungle warfare. Experimental batches only - a matter of hundreds - they didn't end up being adopted.
