It should be Stock Service Pistol Division (SSP). But it all depends on the internal workings if the striker is cocked and released or just released. I believe the M&P is a cocking action striker gun. If the striker is just released than it falls into the Enhanced Service Pistol Division (ESP). M&P guns where not out when I shot IDPA, Now I shoot USPSA and the M&P is a Production Class gun. IMO IDPA has way too complex in its rules and procedures to be a fun sport.