Description
Cyma MP5 Gear Box (CYMA-CM03)
This is a complete replacement gearbox from CYMA for its MP5-series AEGs, under code CM03. A European retailer lists the CYMA CM.03 MP5 gearbox as a complete Version 2 gearbox supplied with a motor and ready to install, which makes it a quick way to bring a tired or damaged CYMA MP5 back into service.
CYMA is one of the biggest names in affordable airsoft, and its MP5 family is a long-running favourite for CQB. Replacing a complete gearbox is often quicker and simpler than rebuilding one part by part, especially if several components are worn.
Internals
The same retailer lists the gearbox with an 18:1 torque gear set, metal gears, a polymer piston, a full metal rack and 6mm bushings, with a weight of about 660g including the motor. These are the details for the CM.03 gearbox as listed; please compare with the product photos to make sure this is the version you need.
Why a complete gearbox
When a gearbox has stripped gears, a cracked shell or a worn piston, a drop-in replacement gets you playing again quickly and gives you a known-good starting point. Many technicians also keep a spare complete gearbox so a player’s gun can be swapped over on the day and the original repaired later.
Fitting
Remove the battery, take out the magazine and strip the MP5 to access the gearbox. Disconnect the wiring, lift out the old gearbox and fit the new one, then reconnect, reassemble and test-fire. Have your replica chronographed before playing, as a new spring and seals can change power.
Key features
- Complete gearbox for CYMA MP5-series AEGs
- Version 2 gearbox (per retailer listing)
- Supplied with motor (per retailer listing)
- 18:1 torque gear ratio (per retailer listing)
- Metal gears and full metal rack
- Ready to install
Compatibility
Made for CYMA MP5-series AEGs. MP5 replicas from other makers may use different gearbox versions, wiring or motor heights, so check your replica before ordering. Fit with the battery disconnected.
Care and maintenance
Run the gun with a fully charged battery of the right type, avoid long bursts of dry firing and use good quality seamless BBs. Clean the inner barrel regularly so the gearbox is not working against a dirty barrel.
If the gun starts to sound rough or slow, stop and have it inspected rather than continuing to fire.
Who is it for?
It is for CYMA MP5 owners and technicians who want a straightforward replacement gearbox to repair or refresh an MP5.
Please note: Specifications are from a retailer listing for the CYMA CM.03 gearbox; please check the photos to confirm before ordering. If you are not confident working on AEGs, have it fitted by a technician.
