Description
Bolt Pinion Gear (MGB07)
This is a replacement pinion gear from Bolt Airsoft, listed under part code MGB07. Bolt is a Taiwanese manufacturer best known for its B.R.S.S. recoil-system AEGs, which use their own gearbox designs and spare parts. The pinion gear is the small gear fitted to the end of the motor shaft, and it is the first link between the motor and the gearbox.
The pinion takes a lot of stress every time the motor starts, and a worn or chipped pinion can cause grinding noises, poor trigger response and damage to the bevel gear it meshes with. Replacing it with a genuine part is a straightforward way to restore smooth running.
What the pinion gear does
When you pull the trigger, the motor spins the pinion gear, which turns the bevel gear in the gearbox. The bevel gear drives the spur and sector gears, which pull back the piston and compress the spring. Because the pinion is so small and spins so quickly, correct mesh with the bevel gear is vital. If the motor sits too deep or too shallow, the teeth wear fast.
Fitting
Removing and fitting a pinion gear usually needs a pinion removal tool to avoid damaging the motor shaft, and the new gear must be pressed fully and squarely onto the shaft. Once the motor is back in the gun, adjust the motor height until the gearbox runs smoothly and quietly. If you are unsure, ask an airsoft technician to fit it.
Key features
- Genuine Bolt replacement part
- Pinion gear for the motor shaft
- Part code MGB07
- Restores smooth meshing with the bevel gear
- Replaces worn or chipped pinions
- A sensible spare to keep with a Bolt AEG
Compatibility
This is a Bolt part. The exact Bolt models it fits, and the motor shaft type it suits, are not stated in our listing. Bolt internals can differ from standard designs, so compare it with your existing pinion and check your model before ordering, or contact us with your replica’s details.
Care and maintenance
Check the pinion and bevel gear whenever the gearbox is open, and replace them as a pair if both are worn. Avoid dry-firing for long periods and keep the motor height correctly set. A smooth, quiet gearbox is the best sign of good mesh.
Who is it for?
This part is for Bolt AEG owners and technicians replacing a worn or damaged pinion gear, and for players who like to keep a spare on hand.
