About 6-7 weeks ago I posted a note here about a 586 (no dash) I had traded for at a local gun show without the "M" stamp. I had sent it back to Smith&Wesson for the recall modification and they gave me some recommended repairs. The gun came back today and looks/feels fantastic. Here's the rub: they did not put in an "M" stamp. If I sell the gun no big deal because I have the paper work that the "modification" ("M") was done but I am curious if any of you might have an explanation of why they did put in the "M" stamp? Thank goodness I have the paper work to prove that the "M" was done. Thanks for replies. -Jeepster