Jefftron Processor Unit V3


Jefftron Processor Unit V3





This is a Professionally made, program-controlled device with motor active braking, designed for use in airsoft electric guns (AEG) with a version 3 gearbox.

This device adds new ways of shooting, controls your rate of fire, pre-cocking, active braking and has a low battery indication.

The device is fully integrated inside your version 3 gearbox instead of the trigger contacts as in the original design. This product is also compatible with Tokyo Marui standard version 3 gearboxes.

This processor unit can be used in a variety of airsoft weapons including AK, G36, SIG, FN FAL, MP5k and more.


  • Easy installation inside a V3 Gearbox 
  • Preserves trigger mechanical lock in SAFE position
  • Six new shooting modes, one of them is unique when compared to processor units located outside gearbox
  • Adjustable burst (from the factory are 3 shots, it can be changed in the range 1 - 10 shots)
  • Smooth change rate of fire using PWM motor control
  • Pre-cocking function for an instant shot in SEMI fire
  • Quick first shot at reduced rate of fire
  • Mosfet with motor active braking
  • Adjustable strength of active braking (can be also disabled)
  • Low battery indication 2S - 4S li-pol and 3S - 4S li-fe
  • Monitoring current, voltage and temperature of Processor unit components
  •  The trigger of your airsoft gun is used for programming this device, and the motor vibrates as a feedback for the user
  • Programmed settings are stored in the processor units memory, so it doesn't loose changes after disconnection of the battery

Fire mode options:

  • Safe - Semi – Auto (unchanged gun function)
  • Safe - Semi - Burst/Auto
  • Safe - Semi - Semi
  • Safe - Semi - Burst
  • Safe - Semi - Semi (delay between shots, motor vibration when it is ready to fire)
  • Safe - Burst - Burst/Auto
  • Safe - Semi/Burst - Burst/Auto (unique fire mode only available with this drop-in processor unit)

Key Points:

  • Only for use in electric airsoft guns with a V3 gearbox, with switch designed according to the Tokyo Marui company. Not for use in AUG guns.
  • Devices without wires, you can use max. 1,5qmm (AWG16) power wires and 0,25qmm (AWG21) signal wires
  • If you are not familiar with soldering to the circuit board, choose device with wiring.
  • Designed for spring strengths up to M180 and ROF 25bb/s.
  • For this device to function properly it is necessary to have a functional gearbox cut off lever, selector plate, reverse latch, trigger and trigger block, as is the standard in an airsoft weapon gearbox
  • Specified for common batteries up to 17V (Ni-xx 8.4 - 12V, lipol 7.4 - 14.8V)
  • Current device consumption only 4.5 mA in idle state
  • The braking effect is the most powerful with high torque motor

Please note - Fitting this part requires gun disassembly and reassembly, and should be fitted by an experienced airsoft technician.

Remember - if you don't feel comfortable carrying out your own gun servicing, repairs or upgrades, we have experienced airsoft technicians in-store and can do the work for you. You can even book a service with us online by clicking the link below!

Book a Gun Service.


To buy an airsoft weapon in the UK you must have a valid airsoft defence.

This is not a licence, it is basically just proof that you intend to buy an airsoft weapon for use in airsoft.

An airsoft defence could be a UKARA or membership with the British Airsoft Club, and various other forms of defence.

You can only obtain an airsoft defence once you are over the age of 18.

To get an airsoft defence the law is that you should play at least 3 games of airsoft, and that you must have been playing for at least two months.
You can still buy an airsoft gun without a defence, provided you are 18 or older. If you choose to do this we would, by law, two tone (paint in a bright colour) parts of your chosen weapon. This is because an airsoft gun is considered a RIF aka Realistic Imitation Firearm, because they are so close to the real steel, whereas when you paint parts of it in a bright colour it becomes an IF aka Imitation Firearm. The reason being that the bright colours make it look less realistic to the public, and therefor less likely to be mistaken as real, were it to be used for any other purpose than airsoft.

When you order a gun from us you will need to add your defence details in the comments section of the cart. If you do not have a defence you will need to write the colour that you wish to be used for two toning your airsoft weapon.

Here is what's stated in the VCRA (Violent Crime Reduction) Act:

For airsoft skirmishing, the Association of British Airsoft is putting in place arrangements to allow retailers to check that individual purchasers are members of a genuine skirmishing club or site. The key elements of these arrangements are:
1. new players must play at least 3 (three) times in a period of not less than two months before being offered membership
2. membership cards with a photograph and recognised format will be issued for production to retailers
3. A central database will be set up for retailers to cross-check a purchaser’s details
4. member’s entry on the database will be deleted if unused for 12 months.
The defence for airsoft skirmishing can apply to individual players because their purchase of realistic imitation firearms for this purpose is considered part of the “holding” of a skirmishing event.
Size Chart