It wasnt a US company. It was a foreign gunmaker and the ATF approved the import of the pistol in 2010. They wanted this to happen.
There is principle involved but OTOH, 5.45x39mm is not much of a round. Lot of ammo sellers can't even give it away. Best to stick with 7.62x39mm. I expect I have enough of the old Yugo M76 to get me through whatever is coming.