2 things have come to my attention when disassembling a colleague's M&P10:
Drop in trigger modules are impeded by the ambi bolt release which must be removed in order to install. Recommend going with non-modular upgrade to trigger due to this.
Factory trigger pins are funky, non-mil-spec, grooves are in the wrong places.
Both the safety selector spring and the take down pin spring are held in by the pistol grip? Odd...
And I still think the flash hider is odd looking...