The US commercial market for guns and ammo is large enough that almost any foreign manufacturer will be justified in setting up a US subsidiary to manufacture their product within the US, thereby avoiding any export restrictions in their own country. Such companies as Glock, Sig, Beretta and H&K did this long ago. Other foreign companies have licensed their production to established US manufacturers, such as Walther to Smith & Wesson. As for Glock, I'm confident that they will do whatever they have to do in Smyrna, Georgia to keep Glocks and Glock parts coming to the US market.