The Australians and New Zealanders used an FN, which may have looked similar to the HK. The primary NON-WW2 rifles used in the Vietnam War were:
M14
M16; XM177E1; XM-177E2; CAR-15; M203; M700; M60; M79
Special forces: HK33; M3; S&W; ....
To much to say, The seals could buy their own weapons, so there was a variety
Australian-FN (edit, L1A1)
NVA/VCzhyphenzSKS & AK-47
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