The gun does take other brands of mags (Jing Gong, Tokyo Marui, Classic Army etc.) This package includes a tightbore barrel (installed) metal bushings (installed) new shims (installed) an Intellect 8.4v battery, the stock battery, a 8.4v mini wall charger, a high-cap mag, the Echo1 g36c, 200 .20g BB's, the cleaning rod, the original barrel, and the original packaging and paper work.