Ver. 2 Rear-Wiring Quick Spring Change Golden Gearbox for M4 Series - M190

The King Arms Version II Quick Spring Change Gearbox is rear-wired and designed for M4/M16 AEGs, with a golden shell that provides the gun with a luxurious style . The power circle comes with a reliable MOSFET gives accuracy triggering.All King Arms complete gearbox are tested by our techenian and it is ready to be installed to your AEG directly. It equipped with 8mm bearings,metal spring guide, black cords, M4 selector plate and M190 spring.