I just finished my IDPA SO refresher certification class and it appears that the new 2017 rule book no longer excludes dust covers for ESP class which means that the SP01 Shadow Target pistol should be legal for IDPA ESP class.
In the past the Target pistol has not been legal in SSP class because of the machined slide to accommodate the sights, though the dust cover was ok,
and.. for ESP the dust cover was not legal, though the machined slide was OK.
It appears that for 2017 IDPA has dropped the restriction on the dust cover in ESP class.....so the Shadow Target model should be good to go.