The Final Resolution:
I just got my Shield back a few hours early. I will be leaving for a couple days so I'm glad I have time to post!
There is a sheet in the return box that explains they did nothing to the gun, and it met all factory specs. This sheet was held in place by a new 7 round mag, so that's not bad.
However when I broke the gun down, I found a new recoil spring and some polishing was done.
The polishing I can see was in the throat of the chamber at the top of the barrel right under the top lug. And it almost looks like the chamber has a slight chamfered edge at the opening now. I'm not sure if that was there previously though. Maybe they spun a tool in there to see if everything was at spec?
Also as I suspected the trigger bar tip where it strikes the sear disconnect bump on the slide is polished. The little groove is still noticeable but not nearly as bad. The bad part is there is now a slight nick in the trigger bar (not where it touches anything, perhaps a vice mark?) and a slight grittiness in the trigger on take up.
I want to do a good cleaning and see if the grit goes away. The gun looks like it was shot a few times as it was clean when it went in, and now has residue all over the place.
Okay I was cleaning while typing and the grittiness came from the trigger bar lifting the sear. I tried cleaning and it was still there but a good flushing of CLP got out whatever was under the sear and now it's smooth again.
And a check with the old 7 round mag filled with one in the chamber causes the gun to still stay OOB. It doesn't if I leave a round out.
So now I have to schedule some time to get out to my range. I will see if the gun still shoots good, I can't see why it wouldn't.
I'm torn between dumping it because I don't like how the slide is working, and keeping it as a knock-around gun with one less round in the mag. My 11 year old likes shooting it, but he likes the 9c also.
I may also list it in the classifieds looking for trades for a TSW. These Shields are hot right now and I'm not real hot on it, so now would be the time to sell....
Anyway, that's the saga. S&W worked on it a bit, made it better, but with a full mag and one in the pipe it will hang OOB. I guess that's the way Shields are.