Reinforced Ver. 2 Rear-Wiring Quick Spring Change Gearbox for M4 Series - M135

The King Arms Reinforced Ver.2 Complete Gearbox is rear wiring and designed for M4 / M16 AEG. All King Arms reinforced complete gearbox series have been tested by our technicians and are ready to be installed directly into your AEG.

It equipped with 8mm bearings, silver power cords with MOSFET, M4 selector plate ,M135 spring, Reinforced Full Metal Teeth Piston(KA-PT-15),18:1 HQA Steel Normal Torque Gear Set(KA-02-10), Steel Bearing Spring Guide(KA-PT-16), T-plug power connecter.