Our take: This rugged high capacity magazine is designed for UA bullpup-style AEGs and holds more than 300 rounds, giving you plenty of ammo for intense airsoft games. This magazine is constructed out of high quality polymer and is compatible with JG, Echo 1, Classic Army and Tokyo Marui AUG style AEGs. Features: - Durable polymer construction - Holds up to 330 rounds - Compatible with JG, Echo1 and Classic Army - Gear wind-up mechanism for easy feeding Color: BLACK