Description Replacement gearbox shell for any G&G version 2 gearbox gun. This gearbox is a blowback shell, so it has the space at the top to add the pneumatic blowback mechanism (though you do not have to use it). Suitable for any V2 gun, though optimised for G&G Raider, Top Tech 418, GR4 CQBS Mini, MP5 etc. Installation of a new gearbox shell is a complicated job, and requires good knowledge of the internals of an airsoft gun. Even factory replacement shells may require a new shim job, as there could be subtle differences that could cause the gears to bind. Installation requires complete disassembly of your gun.
