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£59.99
  • 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.

£139.99
  • Integrated MOSFET
  • Lube / AOE Window
  • 8mm Bearing Gearbox

A complete gearbox built to Krytac's high standards, which is ideal as a replacement for Krytac models or for transplanting into other Version 2 compatible weapons for Krytac level performance.

£259.99
  • Inspection Ports
  • Interlocking Design
  • Reinforced Gearbox

A complete reinforced Airsoft Gearbox for front wired AK platform replicas, which is jammed packed with aftermarket parts and features to ensure top-tier performance.

£259.99
  • Inspection Ports
  • Interlocking Design
  • Reinforced Gearbox

A complete reinforced Airsoft Gearbox for rear/top wired AK platform replicas, which is jammed packed with aftermarket parts and features to ensure top-tier performance.

£17.99
  • Reinforced Shell
  • Aluminium Made
  • For 8mm Bearings

This Reinforced Gearbox Shell is a V2 designed which is ready to accept components and go into a fresh build! The front portion of the Gearbox Shell has been reinforced and strengthened to improve life space, as well as having thicker walls where stress would normally be found. The Gearbox is ready to mount 8mm Bearings, and is ideally suited for Jing Gong replicas. Other brands may require modification to fit.

£29.99
  • Metal Gears
  • Polymer Bushings
  • AEP & MP7 Models

A replacement gearbox for CYMA branded AEPs, such as the G-Series, CM.127, CM.125 and others.

£44.99
  • High Quality Build
  • Interlocks Perfectly
  • 8mm Steel Bearings

A replacement Gearbox Shell for Version 2 accepting Airsoft AEG Gearbox created by Action Sports Games as part of their Ultimate Upgrade Range of Airsoft Components and Parts.

£44.99
  • Complete V2 Gearbox
  • Pre-shimmed from the factory
  • Includes Standard long shaft motor

Has your M4 stopped firing? Either can't or won't go inside the gearbox to diagnose the issue? If you are anything like me, you will appreciate this item, as replacing the complete gearbox is the most time and cost-efficient method of bringing a dead AEG back to life. The gearbox comes fitted with a fuse and mini Tamiya connector and is pre-shimmed at the factory. This is a basic but affordable gearbox and is compatible with the vast majority of AEG AR15 replicas.

£49.99
  • Pre-Assembled
  • High Torque Motor
  • Reinforced Alloy Gears

A pre-assembled, ready to use complete gearbox set designed for use in 6mm Airsoft BB replica M14 AEGs. With all the components assembled and in place, this gearbox is ready to be dropped into place in your M14 AEG, replacing any old and worn out gearboxes.

£49.99
  • For CYMA P90
  • Complete Gearbox
  • Replace All At Once

A complete V6 gearbox designed as a replacement for CYMA P90 AEGs to breathe new life into your weapon.

About Our Airsoft Gearboxes

Exactly what it says on the tin, our selection of airsoft gearboxes are either complete and fully functional or a high-quality shell for you to start your own dream gearbox from the ground up. Our AEG gearbox shells come with the exact parts you want to create your custom monster airsoft gun, with M4-compatible gearboxes, as well as pistol gearboxes designed especially for AEPs

Our AEG gearboxes are ideal for upgrade modifications or if you simply feel like diagnosing a fault is too much of a chore. You can replace the entire gearbox in one go and get back to your skirmish in no time.  Gearbox replacement is the most affordable way to bring your AEG back to life without splashing out on a brand new weapon. 

Our collection includes V2 and V3 gearboxes, always made from materials designed for longevity like aluminium and steel. V2 gearboxes are ideal for M4 replicas, especially when they consist of thick walls for ultimate longevity. 

Shop our airsoft gearboxes online today with Patrol Base for next-day delivery. Or explore our wider selection of upgrades, including bushings and bearings, pistons, and more. We even have parts for gearboxes, including a wide range of airsoft gears and ratios