Is there such a thing as an official NATO round and weapon standard?
.. or is technology evolving like our NATO relationship that will eventually create huge black markets for old ammo&weaponry? just like the old days.
There are a number of NATO standards, but the thing is that nobody is really happy with the 5.56 SS109 and successors any more and it looks like the 5.56 is too small to do what people are wanting it to do now. Many 5.56 weapons may be convertible to 6.8, though.