It sounds to me it was likely the polishing which reduced the trigger pull so dramatically, not the spring.
I recall reading about something folks were doing for awhile to essentially get a free factory trigger job was to contact S&W, then tell them that the trigger on their Sigma "felt gritty" which often prompted the CS Rep to send them a free shipping label, then they'd mail in their Sigma and it would come back with polished trigger components and a 7lb trigger.
Also, another thing I read is that the pigtail spring doesn't add much weight at all because all it actually does is something simple like reset the trigger or the trigger safety, so it's actually better to just leave it in.
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