I sent my 5906 into S&W last year to have them replace a grip pin, and they did it a quick once over. Noticed when I took it apart they had half polished the feed ramp. Not to say they were sloppy as the gun functions extremely well, but it looks like it took them about 5 seconds. As they is some shine towards the top of the ramp just underneath the barrel, and lower on the ramp it looks like the tool they used just got swirled around a couple times. So it looks partially polished in erratic movements. The gun functions fine, and don't really see a need to touch it up, where the gun functions well.