I've got a 640-1. I put Altamont Boot grips on it because, I don't mind the shorter length due to the fact that I pocket carry the gun in a Mika Pocket Holster most of the time.
While I like the trigger on the 640 and don't think I'll change it at this time, I wouldn't hesitate to put an Apex Duty, Carry Spring kit in it. I've put this spring kit into a Model 60 and I've got a 637 that came with the kit installed.
The kit is very easy to put in and lowers the double action pull to under 8lbs , at least in both of my j frames. I've not had a problem of any kind with light primer strikes in either gun. Hope this helps!
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