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I loved the smoothness I got when I did my Glock trigger years ago, and the M&P turned out very nice as well. Photos are a little crude but will show where to polish. Mine has had about 500 rounds through it and you can tell where the metal to metal contact occurs. Add a little knowledge of how the system works and you can figure out where to polish. The trigger is definitely smoother and lighter. Crisp break and reset stayed the same (Apex sear and USB). If you dont have the USB, polish the striker block as well. I recommend testing between steps so you dont get too light. Toward the end I eased up on the polishing as to not lighten it too much.
This is what I used.
I used Q Tips, but removed most of the fibers from the end, leaving me with a small layer of fiber between the metal and the hard stick.
Polish the areas outlined in red. This took about 30 minutes, by hand, including disassembly and reassembly.
Where the trigger bar interfaces with the sear and striker block
Where the sear interfaces with the trigger bar
Where the striker interfaces with the sear
Where the sear interfaces with the striker (I didnt polish much here. This was my last step and the trigger was getting light)
Take up is smooth and instant, break and reset are crisp and consistent. As always, take care with reassembly ensuring all safety mechanisms are functional.
Afterthought: wondering if you could put the qtip into a drill chuck... Hmmm....
This is what I used.
I used Q Tips, but removed most of the fibers from the end, leaving me with a small layer of fiber between the metal and the hard stick.
Polish the areas outlined in red. This took about 30 minutes, by hand, including disassembly and reassembly.
Where the trigger bar interfaces with the sear and striker block
Where the sear interfaces with the trigger bar
Where the striker interfaces with the sear
Where the sear interfaces with the striker (I didnt polish much here. This was my last step and the trigger was getting light)
Take up is smooth and instant, break and reset are crisp and consistent. As always, take care with reassembly ensuring all safety mechanisms are functional.
Afterthought: wondering if you could put the qtip into a drill chuck... Hmmm....
Bob B. 
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