Features Low width profile compare to most drum mags / stay out of shooter's way No manual winding required Extremely fast reloading Manufacturer: Matrix Specifications: Compatibility: For Tokyo Marui, ICS, Classic Army, G&P, JG, A&K, Echo1, G&G, Matrix and other compatible M4 M16 Series Airsoft AEG Rifles Capacity: ~5,000 rounds Caliber: 6mm Airsoft bb Control: Automatic Wind / Pressure Switch / Sound controlled. Package Includes: Box Magazine, Charger. Weight: 510g