I sure everything above is on his short list to ban, but it pays to read the article. What he signed TODAY has nothing to do with ammo, mags, parts kits or any other firearms except those the U.S. SOLD OR DONATED to an ally, for example, the M1 rifles from Korea are now banned from import.
Since it applies to firearms the U.S. sold or loaned, like you said, it pretty much means this ONLY affects M1 Garands and carbines. There isn't much else out there on the market that is getting re-imported for general consumption.
I haven't seen the actual copy of the EO yet. It'll be interesting to see if this kills the CMP.