Check out my page for other items of interest! I reasonable offers on most items, combine shipping when possible on multiple purchases, and ship within US only! This electric auto winding drum magazine will auto wind itself when the sensors picks up the sound from the gearbox. So your job is just to shoot! Not very Mil-Sim, but we know you'll love it! Features: 3000 Round Capacity Auto-Winding Sound Control Pressure switch included > Activation: On / Off / Sound Control switch. Manufacture: Avengers Capacity: 3000~3500 Application: For Matrix, Tokyo Marui, G&G, G&P and other similar M4 / M16 Series Airsoft AEG Rifles Untested condition