Name the weapons

[Legbreaker]

It's most likely been pulled from a Huey. As far as I can recall, that's the only Australian aircraft that had them mounted.
I heard of an experiment in Vietnam though where one was fitted to an M113 - it was judged to be a failure, not because it didn't do the job, but because it did it too well. It was described as having ten machineguns all firing at the same target - waaaay too much overkill.

[Grimace]

There's also an earlier MG-34 next to it, I think. I see a Bren to the right of center and a Webley or S&W revolver.

You're right on the MG-34. Actually an MG-34/41...last version of the MG-34 produced.