Specna Arms Complete Reinforced Gearbox V2 with Micro-Contact - Mod2

Specna Arms
Code: SPE-08-023719
  • Complete Version 2 gearbox w/micro-contacts
  • M110 Spring installed
  • Enter and Convert quick change spring system

Is your gearbox giving you issues, but you are afraid to delve inside? If you are after a well put together complete gearbox which won't break the bank, you have found one! The Specna Arms Reinforced Gearbox with Micro-contacts is a complete V2 gearbox with a reinforced shell, 8mm bushings, and a microswitch trigger pre-installed. This is the Mod2 version of the Specna complete V2 gearbox, sporting a discrete black shell and an improved aluminium type 0 cylinder and an aluminium quick-change spring guide. This gearbox sports all of Specna's usual gearbox enhancements, as well as 18:1 ratio steel gears, giving this gearbox the speed to outrun any competitors in this price range!

Full description


The complete gearbox V2 from Specna Arms is a ready to go solution for anyone with a nice M4/AR15 with a dead gearbox, or anyone in the process of custom building their own AEG. If you have ever had the *shudders* pleasure of going inside an AEG gearbox, you will understand why Specna offering this as a complete unit is a massive time and headache saver!

The gearbox shell sports reinforcements in all the key areas the venerable version 2 gearbox design is known to fail, including above and below the cylinder window. These reinforcements serve to prolong the life of the gearbox should you choose to use it in a DMR build with a stronger spring or a high rate of fire build. The gearbox sports 8mm bushings which help keep the AEG running quickly with minimal wear and maximum efficiency.

The internal components present in this complete gearbox are as follows: 8mm bushings, aluminium quick-change spring guide, reinforced steel 18:1 gears, aluminium Type 0 cylinder, dampened cylinder head, air sealed piston head, polymer piston with a steel final tooth, and a polymer air nozzle. A respectable spec list, if we do say so! In fact, unless you are going for something really at the cutting edge of Airsoft performance, this setup will fulfil almost any requirement for a practical skirmish AEG which is built to last!

The trigger system within this gearbox is a micro switch trigger, providing improved trigger response and electrical efficiency when compared to standard copper contacts. This means you can spam the semi-auto all you want, without the risk of arcing causing corrosion on the trigger contacts! The gearbox is fitted with a standard M4/AR15 curved trigger, making it ideal for discrete milsim style builds.

This gearbox is available either wired to the front or to the rear, making it ideal for the vast majority of M4/AR15 AEGs, and practically any build you have in mind. The pre-installed battery connector is a Mini-Tamiya, allowing you to make use of the most prevalent batteries in the Airsoft world without the need to re-wire!


  • Reinforced shell
  • 8mm bushings
  • Rear or front wired to Mini-Tamiya connector
  • Enter and Convert quick change spring system
  • Reinforced 18:1 steel gearset
  • Micro-switch trigger
  • Curved M4/AR15 style trigger
  • Discrete black gearbox shell
  • Aluminium type 0 cylinder
  • Excellent internal spec - Far better than rivals in this price range!

Package Includes

  • Specna Arms Complete Reinforced Gearbox V2 with Micro-Contact - Mod2



Internal Part Type
Complete Gearbox, Gearbox,
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting
Name Variant
Rear-Wired, Front-Wired,

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.591kg


Colour Wheel Greyscale
Item Colour
Construction Icon
Alloy shell with steel gears, various aluminium, polymer and rubber internal components
Internal Part Construction
Polymer, Alloy, Steel, Aluminium, Rubber,

Part Specific

Part for Power Source Type
Weapon Platform
  • AR Platform
  • M4 / AR15 / M16
  • 416 Series
  • Long Gun
  • Assault Rifle
Package Includes
Complete Gearbox

Electric Part Specific

Gearbox Icon
Gearbox Version
V2 Gearbox

Size guide

Parts Fitting

Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff. 

Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.

We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!

Unique Parts

Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.

Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.

If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.