he SSR4 V2 Gearboxes withstood solid testing to be 100 per cent sure they can take a beating. However, if for some reason your gearbox fails, this gearbox shell will work like a charm not only for an SSR4 Rifle. 

The set includes:

Gearbox Shell
V2 Gearbox screws
A set of 8 mm bushings preinstalled