It is possible the forging did come from Korea; at one time, the U.S. Army had something called "offshore procurement" which meant buying a lot of equipment from allied countries, including Germany, Japan and Korea. I don't know if Korea made M1 bayonets, either for the U.S. or for their own use (they did have M1 rifles obtained under military assistance programs), but I do know they later cut the blades of their bayonets to 5"; quite a few of those were sold on the U.S. market.
Jim
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