Our take: The CYMA M5 V2 gearbox is a complete drop-in solution for those who are looking for a reliable yet powerful complete V2 full metal gearbox. This is the standard reinforced V2 gearbox that goes into all of the newest CYMA high-powered M5 AEGs.
The gearbox comes with high performance metal 6mm bushings, an M115 spring, reinforced metal gears, and lubricated to increase performance and durability. Ultimately, it's a premium-grade drop in V2 metal gearbox that is at an unbeatable price.
Note: Airsoft Megastore recommends that all internal upgrade be performed by a qualified airsoft technician. Airsoft Megastore is not responsible for damage to your AEG caused by improper installation. Make sure your AEG is compatible with this upgrade component BEFORE purchase. Any upgrades made to an airsoft gun while it is under warranty will VOID the warranty.