CYMA Complete M4 Rear Wired Version 2 Metal Gear Box
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The CYMA branded metal version 2 gearbox features an M120 equivalent spring, shimmed and lubricated metal gears, polymer piston, and is rear-wired using a small type tamiya plug. An excellent choice for anyone who is building a gun of their own, learning how to tech, or needs to replace a broken or damaged gearbox.