Modify Torus Gear Box

  • Reinforced Casing
  • Assembly Tools Inc.
  • Reinforced Tappet Plate

If you're looking to build a high speed or high FPS setup then you've come to the right place. MODIFY's latest casings come in Version 2 and Version 3 options in either 7mm or 8mm form.

Full description


With a skeletonised upper half you can far easier check your shimming quality of your gears without having to dismantle your build fully or make special tools and hold light in specific angles. You can now access your bevel, spur and sector gear externally whilst both halves of the gearbox case are bolted tight together.

Included within the kit is a heavy duty allen key and reinforced tappet plate too! A must for anyone looking to build a higher rate of fire or high FPS builds. Each casing comes with reinforcement plating on the edges of where the cylinder sits. This spreads the heavy forces and repetition of piston head contact against your cylinder head.

The piston glide racks are also smoothed off to allow for faster and more efficient cycling of your AEG build. This massively reduced any chance of piston binding and gearbox lockup as long as you build the rest of your setup correctly.

Should you struggle at all to build your gearbox completely, you can contact us for a quote with our engineering department to assist in creating your new monster Airsoft setup.


  • Skeletonised upper half to allow for easier access to check gearbox shimming
  • Reinforced edges to prolong gearbox life with high ROF / FPS builds
  • Strong and hard wearing gearbox screws
  • Smoothed piston rack guides for a slicker operation and cylince
  • Reduced piston binding and gearbox lockup
  • Available in 7mm or 8mm form

Package Includes:

  • Modify - Torus Gear Box 
  • Allen key tool
  • Reinforced tappet plate



Internal Part Type
Tappet Plate, Gearbox Shell,
Name Variant
Reinforced V2 Gearbox Shell (7mm), Reinforced V2 Gearbox Shell (8mm), Reinforced V3 Gearbox Shell (7mm), Reinforced V3 Gearbox Shell (8mm),

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.305kg, Approx. 0.27kg,
Product Height
Approx. 9.5cm, Approx. 8.5cm,
Product Length
Approx. 16.2cm, Approx. 16.5cm,
Product Width
Approx. 2.5cm


Colour Wheel Greyscale
Item Colour
Black, Silver,
Construction Icon
Internal Part Construction
Polymer, Alloy,

Part Specific

Part for Power Source Type
Package Includes
  • Tappet Plate Spring
  • Tools

Electric Part Specific

Gearbox Icon
Gearbox Version
  • V2 Gearbox
  • V3 Gearbox
Gearbox Version Compatibility Variant
Version 2, 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.

Need ideas for something extra?