What is a MOSFET in airsoft?

31st May 2023

What is a MOSFET in airsoft?

Airsoft guns have come a long way in terms design, functionality, and overall performance. Over time, these firearms have become highly realistic and sophisticated replicas of their genuine counterparts.


Traditionally airsoft guns relied on spring-powered mechanisms, but electric-powered systems and compressed gas-powered guns have now become widely used. This means they are capable of enhanced performance and can shoot at velocities of up to 500 feet per second. To regulate the electrical current and firing rate of these guns, a MOSFET is often used.


In this blog, we will explain what a MOSFET is and how it is used in airsoft.


What is a MOSFET in airsoft and how does it work?


MOSFET stands for Metal-Oxide-Semiconductor Field-Effect Transistor. It is a type of transistor that is commonly used in electronic devices to control the flow of electrical current. In airsoft, MOSFETs are used to regulate the electrical current that powers the gun's motor, allowing for more precise control over the gun's firing rate and improving its overall performance.


An airsoft MOSFET acts as an electronic switch, replacing traditional mechanical trigger contacts in the electrical circuit of the gun. This system powers the motor that drives the gearbox, which ultimately fires the BBs. When the trigger of an airsoft gun equipped with a MOSFET is pulled, it sends a signal to the MOSFET. This signal is typically a low voltage electrical pulse from a microswitch or optical sensor. Upon receiving this signal, the MOSFET activates and allows the electrical current to flow through the gun's circuit.


Additionally, programmable MOSFET units offer advanced features for a more customised shooting experience.


What are the advantages of using an airsoft MOSFET?


One of the main advantages of using a MOSFET in airsoft is that it can improve the lifespan of the gun's components. When a gun is fired, the electrical current that powers the motor can create a surge that can damage the gun's electrical components over time. MOSFETs can help to regulate this surge and protect the gun's components from damage.


Another advantage of using a MOSFET in airsoft is that it can improve the gun's firing rate. With a MOSFET, the electrical current can be regulated more precisely, allowing the gun to fire at a faster rate without sacrificing accuracy or damaging the gun's components. This can give airsoft players a competitive edge in games where firing rate is important.


Some MOSFET units offer programmable functionality, allowing users to customise their airsoft gun's firing modes and behaviour. These features can include burst fire modes, adjustable rates of fire, low battery detection, and active braking systems. Programmable MOSFETs enable players to fine-tune their gun's performance to their preferences and playing style.


What are the different types of airsoft MOSFETs?


MOSFETs come in a variety of configurations and can be installed in different ways depending on the type of gun and the player's preferences.


Some of the more basic MOSFETs are designed to be installed in-line with the gun's wiring, while others are designed to be installed inside the gun's gearbox.


Advanced MOSFETs come with additional features, such as burst fire modes or programmable settings, that allow players to customise their gun's performance to their liking.


How to install a MOSFET in an airsoft gun


Installing a MOSFET in an airsoft gun can vary depending on the specific model and type of MOSFET being used. However, here are some general steps to guide you through the installation process:


  • Gather the necessary tools and equipment: Before starting the installation, make sure you have the appropriate tools and equipment. This may include a screwdriver set, wire cutters/strippers, soldering iron, heat shrink tubing, electrical tape, and a multimeter (for testing purposes).
  • Begin by disassembling the airsoft gun, following the manufacturer's instructions.
  • Locate the existing wiring and trigger contacts within the gearbox. Take note of how they are connected and their positioning or take a photo if its easier.
  • Carefully disconnect and remove the existing trigger contacts from the gearbox. This typically involves unscrewing or detaching any retaining screws or pins.
  • Install the MOSFET in the designated location within the gearbox. Secure it using any included screws or mounting brackets as per the MOSFET manufacturer's instructions.
  • Connect the wiring of the MOSFET to the appropriate terminals within the gearbox. This may involve soldering the wires to the designated points on the MOSFET and the gearbox. Ensure proper insulation and use heat shrink tubing or electrical tape to protect the connections.
  • Before reassembling the gun, it's crucial to test the MOSFET installation. Use a multimeter to check for proper voltage readings and to ensure that the MOSFET is functioning correctly. Test the trigger response and ensure that the electrical current flows smoothly through the circuit.
  • Reassemble the airsoft gun and external components, ensuring that all screws and fittings are securely tightened.
  • Test the airsoft gun to ensure that the MOSFET is working as intended. Check the trigger response, rate of fire, and any additional features provided by the MOSFET.


It's always recommended to consult the manufacturer's instructions for both the airsoft gun and the MOSFET, as they may provide specific guidance and precautions for your particular setup. If you're unsure about the installation process, it's best to seek assistance from a professional airsoft technician.


It’s worth checking whether a replica gun has a pre-installed MOSFET – a lot of modern airsoft guns will have this now.




In conclusion, a MOSFET is an important component in airsoft guns that helps to regulate the electrical current and firing rate of the gun's motor. It can improve the lifespan of the gun's components, reducing wear and tear, increase its trigger response, and give players a competitive edge in games. If you are an airsoft player looking to improve the performance of your gun, consider installing a MOSFET and taking advantage of its many benefits.


It's a small but powerful addition that can make a world of difference in your performance and overall enjoyment on the battlefield – making a MOSFET a must-have for any serious airsoft enthusiast!

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