The botom line is I do not believe that the US made Sig's have any noticable quality problems across the product spectrum. I will continue to own Sig's as they work perfectly for what I want in a handgun, so why change.
Keep believing that to be the case. Cohen is counting on it.
The problems with current production and quality control have roots in every change that Cohen and his management group have made at Sig. Here is just a short list.
GSR 1911 Great gun from premium parts. Capian frames storm lake barrels but Sig was unable to properly fit these precision parts. Guns where hit or miss until they went to in house parts with looser tolerances.
556 rifle hit the streets with mismatch finishes and canted rails. No sights cheap plastic parts from China. The delivered rifle was a pale comparison to the real 55X series rifles or even the proto-types shown at shot.... but the price stated the same. To get something even close to the real thing you are looking at $1600+.
Sig mosquito... horrible trigger only shoots 90% with the most expensive 22LR ammo on the market. Made by a 3rd party.
P220 Milled stainless slide with the old internal extractor.... well documented issues with extraction, feeding the last round from a mag and FTF.
P250 first gen was a disaster. Problems all over the place. Did not sell well. Gen 2 guns have been reduced to a $400 to move the metal.
P238 still has issues because they bought the rights to an avg design and cheapened it to the point of failure. It was built to hit a price point in the competitive mini 380 auto market. The #1 Sig smith in the world will not work on them. Recoil springs last at best 500 rounds, this is direct from Sig, and you might still have issues.
Fit and finish of the new slides is not as good as it used to be. Burrs left in the guns + milled stainless slide + hard nitron finish = gauged alum frames which cannot be repaired.
With every generation the number of MIM parts is increasing.
Now this is not saying Sig is not still making good guns. This does not mean that every gun from Sig is a lemon. It does show a pattern of less quality, lessor R&D with proper test, cheaper parts and customer problems. They increase production but did not increase customer service. Growth has to be even and elastic to keep up on both ends of the business. I believe that your chances of getting a problem Sig have increased since Cohen took over. It might have been .025% pre-Cohen and currently .75% but that is still 3X as high and the prices are not coming down they are going up. IMHO YMMV
Cohens job is to move the metal. He is running the same playbook he ran at Kimber. He increased sales and at the same time damaged the Kimber rep for building quality production 1911. They still moved a lot of metal but turned Kimber into a love them or hate them brand. I personally hop he does not have the same level of success at Sig.
PS before you label me a Sig hater I own more Sigs than any other brand of handgun. I own or have owned a P228 X3/P226/P226 Navy/P220 X3/P250/GSR/P229/SP2022/P245/P225. I criticize them because I love them... LOL