The new issue of GUNS magazine has a write-up of the new P320. Connor really likes it...
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Powder River Precision offers a trigger kit for the XDm that's pretty decent, I have one in my 5.25" XDm 40 and after I figured out that I needed to shave off a bit of the trigger stop it's been great. Been very happy with it. I haven't shot an M&P with a good trigger kit/job done to it so I can't tell you which is better on that aspect though.