I used an M&P Pro factory sear in my Shield and the trigger is very nice. The Pro sear is the same as a Performance Center sear. S&W adds a heavier sear spring under it to bring weight up a little. A lot of people set up their Pros for competition and install Apex sears, so there are a lot of new take out sears to be found. I tried an Apex 063 and it was very nice but too light for carry from just under 4lbs to just over.