I just installed duty carry kit with the aluminum trigger on my shield this weekend and certainly there is an improvement, my trigger pull now is just under 6lb before was close to 8lb. (I left the stock springs, except the striker block spring). Polished the trigger bar and striker block. I felt the difference almost instantly.

Now the duty carry kit won't short the travel or reset those features remain factory, only the fss kit does that but it is not available for the shield. Make sure there is no grittiness on the trigger and the striker block is depressed easily.

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M&P 9, Shield9.