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Geissele states the Geissele Super Dynamic 3-Gun Trigger is only compatible with Mil-Spec AR15's and not compatible with pistol caliber variants. They do not state whether the Geissele Super Dynamic 3-Gun Trigger will work with an M&P15-22 and if using the trigger with that rifle will void the warranty. I recommend contacting Geissele to confirm compatibility of the Geissele Super Dynamic 3-Gun Trigger and that rifle.
This is an old question, but if one decides to use this trigger on 15-22, use the stock pins and stock hammer spring that came with your 15-22. The lighter three gun trigger spring will yield a 2.5lb trigger pull on this gun. The heavier spring an3.5lb pull. Be aware that this trigger works in the15-22 as it will in an AR15... it's super fast for competition, and requires practice to control, so keep is pointed down range, and don'thand it to a new shooter. Add a Borebuddy red spring and a Volquartsen competition bolt, and you have a super fast, super fun range gun. I hope this helps someone decide. The SSA is a safer choice, but if you're really experienced, or like competition with firearms, enjoy it.