Spotteddog, point taken. Thanks for your post.
I was really in love - each time one of the tinkered fixes worked for awhile!
When I was researching - I couldn't find a gunsmith who wanted to try to take this on. For a time, there was mention of one on the web who people were going nuts about (about a year ago). Can't recall his name - but within about 3 months - his website was down and you couldn't find him anymore. Honestly, I probably didn't look hard enough after I found this site and thought I could do it all myself.
My guess was that with so many people on here and the WWW trying to find or design just this one fix to this great gun - a decent trigger pull - that it wasn't just "my" wish. Making it lighter would appear to make MANY folks happy. These same folks talk about loving every other aspect of this gun - especially the grip and reliability - same as me.
But the fact that not too many others have chimed in here yet make me think maybe I was wrong! Oh well!
I'm a tinkerer - but I got tinkered out.
Maybe I can drop the Glock firing pin/striker assembly into the Sigma, but lose the Glock dbl bladed trigger, and replace it with the Sigma flat-faced hinged trigger. But that will still be at about 6#'s. Wait....that's already been done, right?!
I may try again in the future. If I come across one at a show again for the right price -I don't have too much to lose. My first move will be to send it to S&W and ask for a 4# trigger - doesn't hurt to ask, does it?