Bolt Gear Box Shell (M4GB05)
£19.99
A replacement gearbox casing for airsoft AEG internals, listed under BOLT part code M4GB05. Aimed at technicians carrying out repairs, servicing or a fresh build who need to confirm the code against their existing shell.
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Description
The BOLT Gear Box Shell (M4GB05) is a replacement gearbox shell, the casing that holds the main internal parts of an airsoft electric rifle’s gearbox, keeping the gear train, piston and spring assembly located within the receiver.
It is listed as an internal part for build, repair and servicing work. As a shell, it is the casing element of the gearbox rather than a complete unit. The part code M4GB05 is given here so you can match it against the shell already fitted to your rifle or against BOLT’s parts documentation before ordering.
Fitting a gearbox shell is workshop work: the gearbox has to be stripped, the internals transferred across, then the assembly shimmed and timed again. If you are unsure whether this shell is the right pattern for your particular BOLT model, check the code with us before you buy.
- BOLT gearbox shell, part code M4GB05
- Internal part for repair or build projects
- Houses the gear train, piston and spring assembly
- Confirm the code against your existing shell






