Does anyone have a complete list of the second & third gen semi-autos? I found this:
http://world.guns****/handguns/hg01-e.htm

but that list doesn't have some of the models mentioned on this forum (like the 4040, for example).

It seems like there should be a sticky with this info...

The page you found has a pretty complete list. There are some models that S&W made that didn't match the system. The 4040 is biggest example of this. It is a 3913 with a scandium frame, chambered in 40 cal. The other thing that they changed is the numbering of the compact pistols. For instance the 4013 can either be a single stack or double stack magazine, depending on if it was the early or late model. There are some other minor variations, but if you stick around on this board you'll figure them out.

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J.D. Roy