There actually was a Kalashnikov factory in the US producing Real Authentic Kalashnikov AK-47s. Was one of the very early victims of sanctions over Ukraine.
According to the above Pew Pew Tactical article, it looks like those Crimea-invasion sanctions were what started the US-based factory – they set up domestic production in the US to provide their US sales, since they couldn’t import from Russia any more.
The American company, Kalashnikov USA, was initially an importer of Russian-made firearms until the US government banned importation.
Using their familiarity and know-how, the importers became manufacturers, creating their own firearms based on Russian specifications.
I guess that strictly-speaking, the term should still be “AK-pattern”, Kalashnikov or not. Says that it’s based on the AK-103, which is really a descendant of the AK-47.