There's no question Sig had a very rough patch with QC around this rifle. The design is fundamentally very sound, robust, durable, etc.
Mine started life with a QC issue that took two return trips to Exeter, NH, to fix; Sig always paid shipping both ways, and turned it around promptly, so credit for decent CS. And it was always a little balky (1-in-60 problem rate) with its factory mag. I switched to PMAGs, and those run flawlessly.
I am under the impression that later production runs had QC tightened up, but by then some damage had been done to reputation, and you'll get people saying that the rifles are inherently junk. They aren't. The design is a very strong one, and the major components are very strong. There are just some bad examples extant, along with some very good ones.
FWIW, mine has a strong preference for heavier bullets (62 gr and up, really likes 69gr Sierra Match Kings) for accuracy, though it feeds everything I've ever run through it.
As for why someone might turn the gas plug upside down, some people to that for target shooting, because it lets them cycle the gun manually and save their brass. The extraction/ejection process is hard on brass. I was not a reloader when I got my Sig; now that I am, I would probably choose a different gun.
Mine started life with a QC issue that took two return trips to Exeter, NH, to fix; Sig always paid shipping both ways, and turned it around promptly, so credit for decent CS. And it was always a little balky (1-in-60 problem rate) with its factory mag. I switched to PMAGs, and those run flawlessly.
I am under the impression that later production runs had QC tightened up, but by then some damage had been done to reputation, and you'll get people saying that the rifles are inherently junk. They aren't. The design is a very strong one, and the major components are very strong. There are just some bad examples extant, along with some very good ones.
FWIW, mine has a strong preference for heavier bullets (62 gr and up, really likes 69gr Sierra Match Kings) for accuracy, though it feeds everything I've ever run through it.
As for why someone might turn the gas plug upside down, some people to that for target shooting, because it lets them cycle the gun manually and save their brass. The extraction/ejection process is hard on brass. I was not a reloader when I got my Sig; now that I am, I would probably choose a different gun.