Australian/New Zealand Use of M16 Rifle in Vietnam?

[Flying10uk]

In the UK, on Boxing Day, on one of the "Freeview Channels", showed the film "Danger Close: the Battle of Long Tan". The film was made in 2019 and tells the story of a relatively small contingent of Australian and New Zealanders finding themselves getting involved in a battle with a much larger force of NVA regulars.

It seemed like a reasonably well made film but there did seem to be rather a lot of M16 rifles being carried by the Australians and New Zealanders, although some did have the SLR. I thought that during this time period and on deployment in Vietnam Australian and New Zealanders would mostly have been armed with SLR's, with, perhaps, the exception of Australian special forces, some of whom may have carried the M16? The film was made in 2019 and so perhaps the film company had difficulty sourcing an adequate quantity of SLR's for the filming?

Before someone points out "It's only a film.", I realise that. The question is whether the M16 rifle saw much use by Australia and New Zealand in Vietnam which I wasn't aware that it did.

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