Russian Machine Guns Are Lethal (And America's Special Forces Want Them)

Even copyright is a problem, you only have to change 10% to get a new copyright. And I'm sure that we can find a way to make it 10% better.
The soldiers have been asking for something Bigger than a 5.56 for a long time...

Reverse engineer them or just take them, Special Forces can do it.

Plausible deniability. Give weapons that look like they were made in Russia or China with no markings on them. Nope, US wasn't interfering here. Nothing to see, move on.