ARCTURUS Version 3 Alloy Gearbox Shell

Code: AT-SP-K01
  • Alloy V3 Gearbox shell
  • 8mm Bearing holes
  • For AK/AUG/AR36/SMG-5K AEG

Building a gearbox from scratch? You'll need a shell to get started! The ARCTURUS Version 3 Alloy Gearbox Shell is a reinforced design with a radiused cylinder window, additional material surrounding the cylinder for extra strength and 8mm bearing holes. The rear of the gearbox is also cut for a quick change spring guide. 

The version 3 shell is common to AK, AUG, AR36 and SMG-5K AEGs (not the regular SMG-5, though) so if you need a gearbox shell for any of these platforms this one will be compatible in most cases. 

Full description



  • Alloy construction
  • 8mm Bearing holes
  • Quick change spring guide compatible (ARCTURUS recommended)
  • Reinforced design - Extra material around cylinder window
  • Radiused cylinder window - Reduced stress and less chance of cracking
  • Version 3 Gearbox - Suitable for AK/AUG/AR36/SMG-5K AEG

Package Includes

  • ARCTURUS Version 3 Alloy Gearbox Shell



Parts & Accessories Type
Internal Parts
Internal Part Type
Gearbox Shell
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.287kg
Product Height
Approx. 8.5cm
Product Length
Approx. 16cm


Colour Wheel Greyscale
Item Colour
Construction Icon
Internal Part Construction

Part Specific

Part for Power Source Type
Weapon Platform
  • AK
  • AR36
  • AUG
  • Assault Rifle
  • SMG-5K
Package Includes
  • Gearbox Parts
  • Shell

Electric Part Specific

Gearbox Icon
Gearbox Version
V3 Gearbox
Gearbox Version Compatibility Variant
Version 3

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.