It sure is. G-Macc has been on all of the Apt.3 releases except ADR and we are going to be putting out his new release, should be out around November.
G-Macc was on Apt.3 Vol.1 and is on the upcoming Apt.3 vol.2 "Theme Music To Drug Dealins And Killins" on a song with Tre-8, C-Lim and J-Nutt.
G also did a lot of production on Tre's album.