Except for LE or military use, of course. Note that ALL Springfield Armory handgun frames are made in Croatia or Brazil. I'm sure that some other companies are in the same boat. He's going to run a lot of people onto the unemployment line.
Likely will make some of these foreign companies to set up shop in the US.
Likewise Glock, Sig, Benelli, FN, and a host of other guns made overseas at least in part.
He’ll be out to destroy the industry by breaking the supply chain. No grabbing necessary, just wreck resupply, regulate domestic production to death, and confiscate as convenient with minimal incidental impact.