FWIW, any gun made outside the US must, by law, be marked with the country of origin - they don't have to be conspicously marked, but marked (usually stamped into the metal somewhere) they are.
For a manufacturer to place a "Made in U.S.A." sticker on a foreign-made product would be a violation of the Consumer Protection laws.
( IOW, they can no longer get away with "made in USA", meaning the city of USA, Japan - as has been the case every once in awhile in the past, on some products.)