Complete QD gearbox V2 for M4/16 with M120 - rear wiring

Complete gearbox for M4 AEG series. The original gearbox that is used in a number of commercial brands such as Lancer Tactical Sportline, Specna Arms Core, Delta Armory...etc.

Inside the gearbox you will find a classic assembly. A piston with full meatl teeth, 8 mm bearings, or quick spring change. Using an Allen key or a screwdriver, you can easily slide the spring guide and the spring out of the gearbox. Changing the spring is a matter of minutes. Inside is approximately M120 Spring. The length of the nozzle is 21.1mm

This gearbox has a wiring route back to stock.