I was just looking at the latest US Customs seizure list:
CBP OFFICIAL NOTIFICATION POSTED ON DECEMBER 05, 2020
And used the browser search function to look for "AK-12"
Looks like the port in Jacksonville Florida seized a bunch of stuff on 10/13/2020
The magazines were marked as AK-12, they don't make clear if all the stocks, handguards, pistol grips, magazine parts, etc that were seized were also AK-12.
It lists what violation was the cause of the seizure.
1447 pages of entries!
Lots of fake "designer" stuff, bulk US currency, vehicles and trucks, about anything you can think of.
It’s not illegal to import stocks, pistol grips, handguards, optics, front or Rear sights, or other misc gun parts like gas blocks and trunnions.
Only thing illegal to import without proper paperwork is Magazines, receivers, barrels, and ammunition.