Usually not. When I ask for a trigger job, I am looking at enhancing the feel, lightening the pull a little (I really like 4 to 4.5# on a semi auto and about 6# on a DA revolver) improving the reset charactoristics, and allowing a trigger pull to make my shooting more accurate.
For this reason, my M&P 40 was done by Mr Burwell and he currently has my M&P 9MM for the same job. I am now a repeat offender with him
Rick 2524. The trigger jobs as a broad brush stroke here include smoothing it out, getting rid of the gritty feel in the factory trigger. Fitting the sear to firing pin engagement to make the trigger break more crisp. Also decreasing the overtravel and reset. I do two trigger jobs that accomplish this at different points in the trigger cycle. Trigger pull wieght can be then adjusted in this process.
This is kind off a brief over view but I hope this helps.
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