Awhile back, when I was buying that S&W .380 EZ, the guy behind the counter was telling me about all the issues they are seeing with pistols made in the USA. He stated, and listed brands, of the pistols their customers were complaining about/trying to bring back to them vs. sending to the factory for repairs, due to problems. He said it seemed that the pistols made at the original/foreign factories were still good quality pistols and the ones made at the new US factories were the ones having quality/functioning issues.
As they say, your mileage may vary. It was just hear say. I've not bought a SIG, Glock, CZ, etc. made in the USA.