Description
Cyma MP5 / Swat Series Replacement Mosfet Unit
This is a replacement MOSFET unit for Cyma’s MP5 and SWAT series airsoft electric guns. A MOSFET is an electronic switch that sits between the battery and the motor, taking the full current load away from the trigger contacts, which protects them from burning and gives a crisper, more consistent trigger response.
Cyma is one of the most popular makers of affordable airsoft electric guns, and its MP5-style SMGs are a common first choice for CQB players. If the MOSFET in your Cyma MP5 or SWAT series replica has failed, this unit lets you restore it to working order.
Signs of a faulty MOSFET
A failed MOSFET can stop the replica firing altogether, cause it to fire on its own when the battery is connected, or give an intermittent, unreliable trigger. Before replacing it, check the obvious causes first: a flat or faulty battery, a blown fuse, or a loose connector.
MOSFETs can be damaged by short circuits, by running too high a voltage for the unit, or by water getting into the wiring, so it is worth protecting the replica from these when the new unit is fitted.
Fitting
Fitting a MOSFET involves working on the replica’s wiring and may require soldering and opening the gearbox area. If you are not confident doing this, we recommend having it fitted by an airsoft technician. Note the original wiring layout before removing the old unit.
Key features
- Replacement MOSFET unit (as named)
- For Cyma MP5 and SWAT series replicas
- Protects trigger contacts from burning
- Crisper, more consistent trigger response
- Restores a replica with a failed MOSFET
Compatibility
Made for Cyma’s MP5 and SWAT series replicas, as named. Cyma uses different electronics across its range, so check that your replica is one of these models before ordering, and use the battery type and voltage recommended for your replica. If you are unsure, contact us with your replica’s model code.
Care and maintenance
Unplug the battery whenever the replica is not in use, and keep the wiring dry. Use the correct battery and fuse rating for the replica, and check the wiring for chafing or damage when you open the replica up.
Who is it for?
This unit is for owners of Cyma MP5 or SWAT series replicas whose MOSFET has failed, and for technicians repairing these popular SMGs.
Please note: Always wear suitable eye protection when using airsoft replicas.








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