SRC Airsoft SRC STRIKE Series 300rd Airsoft Hi-Cap Polymer M4 AEG BB Magazine - BLACK Construction: Impact Resistant Polymer Capacity: 300 Rounds Operation: High Tension Winding Gea Compatibility: SRC, Echo 1, Tokyo Marui, G&G, G&P, JG, AGM, DBoys, A&K, and other M4/ M16 style airsoft AEGs Color: BLACK