I picked up an M&P 15 and when I opened the box it had these places that looked like gray/white blemishes in the finish. The dealer said it just needed some oil rubbed on it. He said it was just dry spots. He rubbed it with a rag that was very lightly oiled and it seemed to help. So, I got it home and rubbed the spots more with M-PRO 7 gun oil. They seem to be gone for now but I am worried it may start to show again. I read an older post where someone had this same issue but they never followed up with an update. So, has anyone else had this same issue? What was the cause and how was it resolved?