I have been considering getting training to maintain my own guns. I really like my M&P pistols, but from what I understand the gun smithing class is not for civilians. If the classes aren't open for the average joe, is there any way to get trained? This also leads me to wonder if S&W would be willing to sell parts. The two products I know of that allow for this and ease of getting parts would be SIG or Glock. Input is welcome.