Modify Modular 8mm Gear Set for Ver.2/3 Gearbox (Torque 21.6:1)

Modify Modular 8mm Gear Set for Ver.2/3 Gearbox (Torque 21.6:1) CNC Metal Construction ( Thermal Treatment ) Design for Upgrade the Original Parts More Durable Suitable for Version 2/ Version 3 Gearbox Airsoft Guns Include Stainless Bushing (Double Oil Grooves), Stainless Bushes, Anti-reversal latch, Synthetic Lubricant with PTFE