RetroArms CNC Aluminum 7075 M4/M16 Version 2 QSC Gearbox (8mm)

RetroArms CNC Aluminum 7075 M4/M16 Version 2 QSC Gearbox (8mm) CNC 7075 Aluminum Construction (Lightweight) Suitable For M4/ M16 Series Airsoft Electric Gun AEG Rifle (Version 2 Gearbox) Design For Upgrade the Original Parts 8mm Gear