Features Durable injection molded polymer Angel Custom drum magazine holds up to 1500 rounds for extended firepower Electric winding design ensures that your gun is always loaded and ready to go HPA tapped design eliminates the need to gas up your magazines, powered by traditional HPA type air rig Angel Custom Thunderstorm drum magazine provides reliable, consistent and superior feeding compared to other drum magazines Optimized internal design provides consistent feeding and performance High speed winding keeps you in the fight Modular design allows for easy replacement of worn out components Powered by a single, commonly found 9v battery Manufacturer: TAPP Airsoft Specifications: Compatibility: KWA MP7 gas blowback Airsoft guns Battery: 1x 9V battery Capacity: 1500+ rounds Materials: DuPont polymer