Sig Sauers QC has gone down hill since Cohen took over. There are numerous examples of their failures which are not internet rumor or isolated single events. Yes some are exaggerated but there have been many missteps in production under "Cohen's move the metal campaign at Sig. Here is a sampling....
GSR 1911 was a nightmare hit or miss prospect for the first year of their production. If you got one that ran, I did, you got a great gun if you did not you got a paper weight which had to return to sig multiple times to get straight because they had little or no expertise in 1911s.
The CPO spray on black paint issue. At the height of the CPO boom Sig simply sprayed guns with a terrible bake on finish that they did not harden properly and flaked off in the customers hand. shout down the CPO program for a time.
Sig P220 extractor issue on the milled stainless slide. Well know and well documented issue of the internal extractors tolerances being too tight and causing FTF and the final round of a mag not loading. Most who have suffered this failure have had to send their pistols to Sig multiple times to have it corrected. I know I did.
Gailing of the ionized frame by the Nitron finish an milled stainless slide... This is happening more and more these days. Burrs on the slides are destroying frames right out of the box. Prompted Sig to change their factory supplied oil to grease. Run them wet boys or suffer frame damage from hell and back. LOL
Sig 556 rifle came with mismatch finishes and canted rails at it introduction. The need to get the gun to market NOW took priority over getting it right.
P238 recall. Right out of the gate P238 safeties were failing. There are now reports of FTE when the guns hit the 500 round count. Again not just one or two isolated occurrences but multiple reports.
http://thehighroad.org/showthread.php?t=465162
Sig mosquito the guns still is not right by many peoples accounts. Started out as a $500 22lr is now a $300 gun so they can sell them.
P250 originally designed as a 16 + 1 gun but they could not get the mags to hold 16 downgraded them to 15. Multiple out of the box issues reported FTF, FTE & light strikes. Seems to have been corrected for the most part but they had to drop the price of these guns to move them. Again a $650+ polymer which has been discounted to under $500 because of the initial poor roll out directly related to QC.
Guns are no longer fired at the factory beyond the required rounds for states like MD. They are fired for function only no test targets are included. Less hands and less time on each pistol means more production time = more guns leaving Exeter.
Did I miss any?
As their production number grow their QC is going down hill. I am not saying that if you buy a Sig you are going to get a bad gun. Odds are that you are going to get a great gun but if you are a Sig fan and have paid attention you have seen the change over the last 6 years. They are not the same Sig Sauer they once were. IMHO their failure rate has more than doubled. Moving from something in the .5% range to the 1.5% range which when you are moving hundreds of thousands of pistols and rifles ends up being a lot of defective pieces.