Tokyo Marui Scar-H 540 Rounds Magazine (Black)

high capacity magazine (540 rounds) for Tokyo Marui Scar-Heavy, available in black and tan color

Consider opting for an additional magazine and also a dual magazine clamp to increase your skirmishing capacity. An auto-loader also makes loading standard magazines much much easier. Also do not forget to stock up on BB's. For skirmishing, also consider gearing up with a thigh-mounted magazine pouch so that you can carry your spare magazines in style.