Description
Bolt M4 Front Wired Gear Box
This is a Bolt M4 gearbox with front wiring. Bolt is a Taiwanese airsoft manufacturer whose M4-pattern rifles are well known, and this gearbox is intended as a replacement or rebuild base for M4-style AEGs. The wiring position matters because it decides where the battery is housed: front-wired gearboxes run the battery leads towards the front of the replica, usually in the handguard area.
A front-wired gearbox is the right choice if your rifle is set up to carry its battery in the front end. A rear-wired version is also listed in the shop, so make sure you pick the one that matches your build.
What the gearbox does
In an AEG the gearbox is the heart of the replica. The motor drives a set of gears which pull the piston back against the spring and then release it, pushing air through the cylinder and nozzle to fire the BB. The gearbox also houses the trigger, selector mechanism and tappet plate, so it controls both the firing cycle and how the replica feeds.
Before you buy
The listing does not state whether this item is supplied as a bare shell or with internals already fitted, or which springs, gears and piston it uses. Please contact us to confirm the contents before ordering if that matters for your project. Bolt rifles are known for their B.R.S.S. recoil system, so if you own a Bolt replica check whether your rifle needs a recoil-type gearbox.
Fitting
Swapping a gearbox involves stripping the lower receiver, disconnecting the motor and wiring, and refitting the selector and trigger linkages. Remove the battery and magazine before starting, take photos as you strip it down, and keep screws and small parts in a tray. If you are not confident doing this, a technician can fit it for you.
Key features
- M4-pattern gearbox from Bolt
- Front-wired configuration
- Battery leads run forwards
- Replacement or rebuild base for M4-style AEGs
- Houses the firing mechanism, trigger and selector parts
- Rear-wired version also available
Compatibility
Listed for M4-pattern AEGs. Check your rifle’s gearbox version, wiring position, and whether it uses a recoil system before ordering, and compare with your existing gearbox where possible. Motor, battery and other parts not listed as included.
Care and maintenance
Keep gearbox internals lightly and correctly greased: a thin coat of suitable gear grease on the gears and a little silicone-based lubricant on the cylinder and piston O-ring. Too much grease attracts dirt. Use a battery suitable for the replica, store the battery off the gun, and use good quality seamless BBs. If the gearbox becomes noisy or the replica starts to cycle unevenly, stop and have it checked rather than continuing to fire.
Who is it for?
This gearbox suits players and techs rebuilding or repairing a front-wired M4-style AEG, particularly Bolt owners who want a factory part.
Please note: Battery, motor and other parts are not listed as included. Please confirm contents and compatibility before ordering.
