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I have a friend that did his own trigger job on his Sigma in about 15 mins and it feels just as good or better than the m&p that my other friend has, all you do is pull the trigger assembly out of the gun by popping out the polymer pin that holds the trigger assembly together. Then you Take off the outside spring in order to lighten up the trigger. You could always take it to a gunsmith if your not too sure but it was a pretty basic job if your mechanically inclined with basic tools. Hope i was able to help good luck.does anyone know if you can swap an m&p trigger assembly into a s&w sigma. i have the sigma .40 cal i really like it but recently got to fire the m&p .40 cal and loved the trigger pull now i wish my trigger pull was like that.please only respond if you have factual info.