Arik, you are correct. S&W is producing so much product right know, they are setting sales and pistol records they have never dreamed of. In Dec of 2015, S&W announced that they had produced their 1 millionth Shield pistol. That is a bunch of guns! All the manufacturers are just running 24/7 to keep up with the demand, due to the current political situation in this country. With large quantities, quality control slips. Not always, but more often then not, it does.
The small lip of folded over plastic on pg222's pistol is from fast assembly during Cam block insertion into the frame. Machine done? Or by hand? Unknown. But S&W looks at it like this; Does it shoot? If it does, then the pistol has no problem other then a small cosmetic blip. They will not replace the frame unless the Cam block has folded over or mangled up large parts of the polymer frame. I will bet pg222"s pistol comes back to him the same, less the small folded over piece of plastic, having been removed w/ an Exacto blade by the S&W tech's. Again, it falls under the "Does it shoot?" heading. They consider small cosmetic blips to be normal and not anything to worry about. I have been through this w/ S&W before, long ago, and it seems they still abide by the "Does it shoot" mantra.