I do apologize to the OP as it wasn't stated he had an extractor issue. But i still stand by what i said about other people sending back rifles for updates and mags when there was no reason to.
ChattanoogaPhil- I don't keep count, But ive seen threads and post's about this exact issue being done. And its not just springs, It was extractors and swapping of older model mags too when there was no reason for it to be changed out, yet.
As you know S&W has done quite a few updates and fixes and people buying older stock guns weren't happy once they found out they "may" have issues with non current spec'd guns and ive seen several say they were sending these guns in for updated spec parts. Also asking for 2 free mags, Not just replacements.
In the end we all shall pay with longer waits, No freebies for our time when the gun DOES break and most likley only get the broken part updated and not all the older parts replaced.