Reading the IDPA rulebook section 8.2.1 lists all the things that work, and don't work, in SSP division pistols.
The basic stuff is that the pistol must have over 2,000 produced units, fit the box, and weight 43 oz. or less.
The Shadow 2 is out on weight. The Custom Shop SP-01 Target II might be in if it has enough production units. The stock SP-01 Tactical would be fine.
There are a number of legal modifications, but the intention of the division is for STOCK service pistols.