King Arms M150 Ver II Rear Wiring Complete Gearbox for M16A2 AEG
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G&P Complete 8mm Reinforced Gear Box for M4 M16 Airsoft AEG (Configuration: Rear Wired V2 / Standard Deans / 400+ FPS), Accessories & Parts, AEG Internal Parts, Gearbox, Version 2 Gearboxes - Evike.com Airsoft Superstore