the aussie L2 looked similar to the C2 bcos they used canadian made parts .
The difference between them is the rear sight. Canada started making a sliding leaf sight that attached to the dust cover, then switched to a larger version of the C1 disc rear sight. The Aussies stuck with the original leaf sight, which they bought directly from Canada. Everything else was made in Oz.
Only Canada kept the C2 and the automatic rifle concept. The Brits used a re-barreled Bren, and then the GPMG. The Aussies relegated their L2s to reserve and training use during Vietnam because of its deficiencies. They did try to make a modified version called the F2A2. Three prototypes were trialed. They used a higher straight line butstock, new bipod and forarm/heatshield, and the rear sight from a No4 Enfield. In the end, they didn't bother further and just issued a GPMG, first the M-60, and later the FN MAG.
The problem with the C2 (and the whole "automatic rifle" concept), was that it was originally proposed for a less powerfull cartridge. Once the .280/7mm was out and the 7.62 NATO was in, it stopped working. The C2 is just too light and the butstock shaped wrong for effective full auto fire with a full power rifle cartridge.
Most C2s and C2 gunners could not even meet the specified accuracy standard. It split bursts at pretty much any range, and the dispersion was greater than acceptable. The 30 round mags were too big, causing reliability problems because of the high stripping pressure required, and the springs surged in long bursts. They also caused the bipod to be higher than was really comfortable. They should probably have been reduced to 25 rounds. The only good thing about them was that the bipod made them a suitable platform for mounting a NV scope.
IMO the C2 should have been junked in favour of a re-barreled bren or earlier purchase of the FN MAG (C-6).
That said, I would love to add a 12(5) version to my collection. Even more I would love to shoot one again! Jamiejaf is right in his criticism, but a lot of that was the result of the sheer age of those left in service by the time the C7 came along. Other than the infamous "hamburger face" I never had problems shooting any of my rifles. My ex Singapore Police rifle was carried much more than shot and was (is) still nice and tight.