The rectangular shape of the V2 modular suppressor makes your pistol/rifle stick out from the rest.
The difference between the suppressors is the height of the bore axis. Due to the pistol construction, the SSE and SSP are not the same. Therefore, a different suppressors have to be used in order to follow the shape of the pistol and to ensure the compatibility with other holsters.
Left: SSE18 | Center: SSP18 | Right: SSX23