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What is an Airsoft MOSFET?

Airsoft MOSFETs protect trigger contacts, improve efficiency, and enhance performance. Installation involves soldering. Types include basic, active braking, programmable, and integrated.

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Airsoft enthusiasts often look for ways to enhance the performance and durability of their guns. One of the most effective upgrades available is the installation of a MOSFET. But what exactly is an Airsoft MOSFET, and why is it so important? In this article, we’ll dive deep into the world of Airsoft MOSFETs, exploring their purpose, benefits, installation process, types, and more.

Of course an airsoft “MOSFET” contains more than just a MOSFET, it’s just called that as it is the main component.

What is an Airsoft MOSFET?

What is an Airsoft MOSFET

A Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) is an electronic component used to control the flow of electrical current in various devices. In the context of airsoft, a MOSFET is used to regulate the electrical current between the battery and the motor, ensuring that the trigger contacts are protected from high currents that can cause wear and damage.

In essence, an Airsoft MOSFET acts as a switch, allowing the current to bypass the mechanical trigger contacts. This not only extends the lifespan of the trigger contacts but also improves the overall efficiency and response of the airsoft gun.

How to Install a MOSFET in an Airsoft Gun?

How to Install a MOSFET in an Airsoft Gun

Installing a MOSFET in an airsoft gun can seem daunting, but with the right tools and instructions, it can be done relatively easily. Here’s a step-by-step guide:

Tools and Materials Needed:

  • MOSFET unit
  • Soldering iron and solder
  • Heat shrink tubing
  • Wire cutters and strippers
  • Electrical tape
  • Screwdriver set

MOSFET for Airsoft Installation Steps:

Step 1: Disassemble the Gun: Carefully disassemble your airsoft gun to access the gearbox and electrical wiring.

Step 2: Identify Wiring: Locate the wiring that runs from the battery to the motor and the trigger contacts.

Step 3: Prepare Wires: Cut the wires and strip the ends to prepare them for soldering.

Step 4: Solder MOSFET: Solder the MOSFET unit into the circuit according to the manufacturer’s instructions. Typically, one end of the MOSFET will connect to the battery, and the other end to the motor, with the gate connected to the trigger.

Step 5: Insulate Connections: Use heat shrink tubing and electrical tape to insulate the soldered connections and prevent any short circuits.

Step 6: Reassemble the Gun: Carefully reassemble the gun, ensuring that all wiring is secure and there are no loose connections.

Step 7: Test the Gun: Test the gun to ensure that the MOSFET is functioning correctly and the gun is firing properly.

What Does a MOSFET Do in Airsoft?

In airsoft, a MOSFET serves several important functions:

  1. Protects Trigger Contacts: By bypassing the trigger contacts, the MOSFET protects them from high currents that can cause arcing and wear.
  2. Improves Response Time: MOSFETs allow for faster electrical current flow, resulting in quicker trigger response and a more efficient firing cycle.
  3. Enhances Battery Life: By reducing electrical resistance and heat buildup, MOSFETs can help extend the life of your battery.
  4. Enables Advanced Features: Some MOSFETs come with additional features such as active braking, burst fire modes, and programmable settings, enhancing the performance of your airsoft gun.

What are the Different Types of Airsoft MOSFETs?

There are several types of MOSFETs available for airsoft guns, each offering different features and benefits:

Basic MOSFETs: These MOSFETs provide basic protection for trigger contacts and improve electrical efficiency without any additional features.

Active Braking MOSFETs: These MOSFETs include active braking, which stops the motor quickly after the trigger is released, preventing overspin and improving accuracy.

Programmable MOSFETs: These MOSFETs allow users to program various settings such as burst fire modes, rate of fire, and more, offering a high degree of customization.

Integrated MOSFETs: Some high-end airsoft guns come with integrated MOSFETs, built directly into the gun’s electronics for optimal performance.

What are the Advantages of Using an Airsoft MOSFET?

What are the Advantages of Using an Airsoft MOSFET

Using a MOSFET in your airsoft gun offers several key advantages:

Extended Lifespan: Protecting the trigger contacts from high currents helps extend their lifespan, reducing the need for frequent replacements.

Improved Efficiency: MOSFETs enhance the efficiency of the electrical system, leading to better performance and longer battery life.

Enhanced Performance: Faster trigger response and additional features like active braking and burst fire modes can significantly enhance your airsoft experience.

Customization: Many MOSFETs allow for programmable settings, giving you the ability to customize your gun’s performance to suit your preferences.

What is the Difference Between Airsoft ETU and MOSFET?

The terms “ETU” (Electronic Trigger Unit) and “MOSFET” are often used in the context of airsoft guns, especially AEGs (Automatic Electric Guns). Here’s the difference between them:

Electronic Trigger Unit (ETU):

  • An Electronic Trigger Unit (ETU) is a comprehensive electronic system that replaces the mechanical trigger contacts found in traditional AEGs.
  • It typically includes a microswitch or optical sensor to detect trigger movement and initiate firing.
  • ETUs often offer advanced features such as programmable firing modes (semi-automatic, burst, full-automatic), pre-cocking, and active braking.
  • ETUs are designed to enhance trigger response, improve reliability, and provide customizable shooting options.
  • They are more complex and usually more expensive than basic mechanical trigger systems.

MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor):

  • A MOSFET is an electronic component used primarily to protect the trigger contacts of AEGs from electrical arcing and burning.
  • It works by electronically switching the high current that flows through the trigger contacts during firing.
  • MOSFETs can provide additional benefits such as reducing wear on trigger contacts, improving battery efficiency, and enabling features like active braking.
  • They are simpler in function compared to ETUs and generally focus on protecting the electrical components of the gun rather than enhancing trigger performance.
  • MOSFETs can be basic (inline) or advanced (programmable with additional features like burst fire modes).

Key Differences:

  • Function: ETUs primarily replace mechanical trigger systems and offer advanced firing options and trigger enhancements. MOSFETs primarily protect trigger contacts and enhance electrical efficiency.
  • Features: ETUs include features like programmable firing modes and pre-cocking, while MOSFETs focus on electrical protection and sometimes offer active braking.
  • Complexity and Cost: ETUs are generally more complex and expensive due to their advanced electronics and features. MOSFETs vary in complexity but are typically simpler and more affordable.
  • Installation: Installing an ETU often requires more modification to the gearbox and trigger system compared to installing a MOSFET, which is relatively straightforward.

FAQs about Airsoft MOSFET

Is airsoft MOSFET worth it?

Yes, using a MOSFET in airsoft guns can be very beneficial. It helps protect the trigger contacts of your AEG (Automatic Electric Gun) from burning out due to the high current drawn during rapid firing. This extends the lifespan of your gun and ensures consistent performance over time. MOSFETs also often provide features like active braking, which improves trigger response and overall efficiency.

Why do I need a MOSFET?

In airsoft, particularly with high-performance AEGs, a MOSFET is recommended to prevent damage to the trigger contacts caused by the high current and arcing during rapid semi-automatic or full-automatic firing. It also improves electrical efficiency and can add functionalities like burst fire modes or active braking.

What are the disadvantages of a MOSFET?

While MOSFETs offer significant advantages, there are a few potential disadvantages:
Cost: Quality MOSFETs can be expensive, especially ones with additional features like programmable settings.
Installation: Installing a MOSFET may require some technical skill, as it involves soldering and potentially modifying your gearbox.
Compatibility: Not all airsoft guns are easy to retrofit with a MOSFET, depending on their design and space constraints.

Do MOSFETs degrade over time?

Like any electronic component, MOSFETs can degrade over time, especially if they are exposed to excessive heat or current beyond their rated specifications. However, good quality MOSFETs designed for airsoft applications are typically robust and can last for a long time under normal operating conditions. Regular maintenance and ensuring proper installation can help extend their lifespan.


An Airsoft MOSFET is a valuable upgrade for any serious airsoft player looking to enhance the performance and longevity of their gun. By protecting the trigger contacts, improving efficiency, and enabling advanced features, MOSFETs offer a range of benefits that can significantly improve your airsoft experience.

Whether you’re a beginner or a seasoned player, understanding the importance and functionality of a MOSFET can help you make informed decisions about upgrading your airsoft gear.

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