No, you would need the regular AR10/AR15 tigger.
Yes, this trigger will definitely work in an AR9 pistol.
Yes, the CMC Triggers AR-15/AR-10 9mm PCC Single Stage Drop-In Trigger will be compatible with the S&W M&P 15-22.
You would need to use this trigger.
The CMC Triggers AR-15/AR-10 9mm PCC Single Stage Drop-In Trigger should be compatible with the Sig Sauer MPX but may require some modification. I would recommend an MPX specific trigger like the Timney Triggers SIG MPX Single Stage Drop-In Trigger, found by using the link below:
https://www.opticsplanet.com/timney-triggers-sig-mpx-single-stage-drop-in-trigger.html
Yes, the CMC Triggers AR-15/AR-10 9mm PCC Single Stage Drop-In Trigger fits MIL-SPEC AR-15 and AR-10 style rifles.
I would recommend using the Triggertech Adaptable FN FX9 Two-Stage Trigger (designed specifically for the FX9), and can be found by using the link below:
https://www.opticsplanet.com/triggertech-arftbb36nnf-adaptable-fn-fx9-black-pvd-two-stage-flat-3-50-6-lbs.html
The CMC Triggers AR-15/AR-10 9mm PCC Single Stage Drop-In Trigger is set at 3.5lbs. The description stating the various pull weights is referring to the other models of the CMC Single Stage Triggers that come in the other pull weights.
Yes, CMC Triggers AR-15/AR-10 9mm PCC Single Stage Drop-In Trigger will work.
Yes, this should be compatible.