McStine plays guitar with In Continuum, a prog/symphonic rock group that includes Dave Kerzner (keyboards, vocals), Gabriel Agudo (vocals), Marco Minnemann (drums), and Matt Dorsey (bass).[citation needed] He has recorded two albums with Minneman as McStine & Minnemann, and he plays with the Fringe, a supergroup that includes Nick D'Virgilio (drums, vocals) and Jonas Reingold (bass, backing vocals).[citation needed]
In 2022, it was announced that McStine and Nathan Navarro became touring guitarist and bassist, respectively, for a reformed Porcupine Tree,[3] replacing frequent collaborator John Wesley.[4]