I have, in certain circumstances, placed a shim under the extractor spring and gotten positive results.

If you do this and it puts too much tension on your extractor I will predict that you may experience feeding issues, but it’s not hard to pull it back out.

My first move (at this point) would be the new extractor spring. If no joy, then sure, try shimming. After that, try a new extractor. I am not certain but it would only make sense if the extractor is the same part that S&W used in all the .45cal 3rd Gens and in the 1911’s too, and still currently used.

To close this post... boy, there’s well over a dozen 945’s across all of my best buddies and I’m telling NO LIES WHATSOEVER, nobody’s 945 pistols are “fail to” anything other than X-ring and ear to ear grins. These pistols are undervalued and mind-blowing fantastic.

I just got back from sending 100 through one of my 945’s.