After regretting getting rid of my 6906 years ago, I was lucky enough to pick up a really nice 6946 last night. Since it's been so long since I had mine and been around them I don't recall what changes were made when...trigger guard, trigger color, etc... is there a good ref list for the line? Like to find it's birth date too but my search seems to suggest a call to S&W is the best bet.