The Mass compliant trigger bar is also different from the standard trigger bar. Dunno about the striker plunger spring.
Now, from the "other" S&W website, the Mass trigger assembly and a Performance Center sear in an otherwise standard M&P9 will give you a crisp 6 ish lb trigger with shorter reset and takeup. I expect the Apex sear would be a reasonable substitute for the Performance Center sear. I'd expect similar results in a Shield.
Or, you could install the standard trigger assembly (trigger, return spring and trigger bar) and see where you end up. However, make sure the parts you're swapping are intended for a Shield .45. There's a bunch of different parts between the 9/40 platform and the .45.
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