Let's temper our enthusiasm for freight loads of cheap guns being imported with the reality of government bureaucracy. Trump could sign off in his swearing in ceremony and it would still be months before any guns hit our shores. They aren't sitting in conexes overseas with the paperwork and approvals all stamped and done.
There will be the ATF agents in place who will place the applications and forms in the pile to work on them first come first served which will require time and effort. Their work will proceed just as it has in the past - government bureaucracy isn't going to change, certainly NOT overnight, as the VA scandals have shown.
Some posts in threads over the Korea guns stated the poster had possibly seen - or was reporting - that observers of those firearms saw them in poor condition, at best. The majority seemed to be barrel grade - the old way surplus guns were sold at stores with more than a few. You literally dragged them out of the barrel and looked them over. The next one wasn't any better. Missing parts externally, cracks and chipped stocks, corrosion, etc. These are Korean Army Garands and they apparently evidence all the typical signs of neglect that most firearms do in the hands of second and third tier countries. It's likely a rack grade Garand that sold for $800 before they ran out will appear as mint.
As for foreign firearms makers coming to our shores and opening plants, they made the investment to bid contracts to the US Government, yes, and to avoid tariffs, sure. One thing not mentioned is that to bid a US contract the item MUST be Made In the USA. This isn't a political point, it's strategic - what good is the contract supplying arms if the vessels carrying them from offshore to here are targeted and sunk? We'd have a huge hole in our national security with that kind of supply issue. The law is known as the Berry Amendment and it's why American uniform suppliers have moved their factories to Puerto Rico, etc. Labor is much cheaper there since we became a "world econonmy" and most of our own clothing factories have shut down. Case in point, the Army can't find a running shoe supplier in the US and has to purchase - wait for it - KOREAN shoes to issue to our troops.
The bigger issue is that business, due to it's own operations, slowly "collectivises" over time as the bigger companies absorb or put out of business their competition. It's like auto parts - in the 1960's most stores were independently owned and operated, they sourced their stock thru jobbers who actually warehoused the larger buik of supply but who didn't sell to the public. In some cases the jobbers simply started their own store chains. In our town we went from a dozen stores to three chains - with about a dozen stores all together.
Firearms manufacturing is no different. How many Brands are under the shell company that owns Remington? One of their current successful guns they purchased from Rohrbaugh. Bushmaster, AAC, LAR Grizzly, Marlin, I've lost track of who is under that umbrella corp. Same with the other makers. Let's add auto makers - that parade goes all the way back to GMC in the 1920's. And some of those Brands are now defunct - no more Pontiacs, no American made Winchesters.
Anybody seen a new Mauser hunting rifle on the rack at their local gun store lately? And yet they supplied millions in WWII. As time goes by makers fall to the wayside. We quit supporting OUR gunmakers - like Colt, who doesn't seem to offer much in the way of revolvers now. Times and fashions tend to stress companies who won't or can't keep up. One of the more iconic Brands, like S&W, can't support their leading edge auto pistol any more - nobody will contract for all metal LEO guns much, the polymer frame as replaced it. So no more 9mm S&W's in police holsters. They were the first changing over from revolvers.
Times change.