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£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.

£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.

£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.

£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.

£19.99
  • Specna CORE™ Gearbox shell
  • Radiused Cylinder window
  • 8mm Bushings included

The Spenca CORE™ V2 Gearbox Shell provides 8mm bushings, radiused cylinder windows to help prevent cracks, and quick release spring functionality. Perfect for starting your ultimate gearbox build! 

£19.99
  • Reinforced 'ORION™' Gearbox
  • Includes bearings
  • Quick change spring compatible

Specna's ORION™ reinforced gearbox has gained an excellent reputation since it was released installed in the EDGE™ series of AEGs, and now Specna are offering you the opportunity to create your next gearbox build with a solid, reliable shell to tie it all together. Rated to handle heavy springs and including enhancements such as radiused cylinder windows and quick change spring functionality, the ORION™ gearbox shell is probably a tad more affordable than it should be!

£19.99
  • Reinforced 'ORION™' Gearbox
  • Includes bushings
  • Quick change spring compatible

Specna's ORION™ reinforced gearbox has gained an excellent reputation since it was released installed in the EDGE™ series of AEGs, and now Specna are offering you the opportunity to create your next gearbox build with a solid, reliable shell to tie it all together. Rated to handle heavy springs and including enhancements such as radiused cylinder windows and quick change spring functionality, the ORION™ gearbox shell is probably a tad more affordable than it should be!

£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.

£29.99
  • For M4/AR15 AEG
  • Metallic blue finish
  • Gearbox shell with micro-switch trigger

The Specna Arms Reinforced V2 Gearbox Shell is constructed from alloy and finished in metallic blue. The set includes the shell itself, the screws to join the two shell halves, a quick release spring guide and a pre-wired microswitch trigger. If you are okay with building a gearbox but are not a big fan of soldering, this pre-wired gearbox could save you some hassle! The pre-installed wiring includes spade connectors for the motor, and a mini-Tamiya connector, and is configured for rear wired AEGs.

£39.99
  • Complete gearbox
  • Version 3 for AK replicas
  • Enter and Convert quick change spring system

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 V3 gearbox with a reinforced shell, 8mm bushings, and a microswitch trigger pre-installed. 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!

£39.99
  • Complete gearbox
  • Version 3 for AK replicas
  • Enter and Convert quick change spring system

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 V3 gearbox with a reinforced shell, 8mm bushings, and a microswitch trigger pre-installed. 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!

£39.99
  • 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!

£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.

£44.99
  • Complete Version 2 gearbox
  • M110 Spring installed
  • Enter and Convert quick change spring system

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 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!

£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.

£59.99
  • Includes Motor
  • 8mm Steel Bushings
  • Version 2 Compatible

Ideal for reviving worn out RIFs or as a backup for a rainy day, this is a complete and assembled gearbox including motor, that is ready to drop into any compatible Version 2 accepting replica.

£79.99
  • Complete gearbox
  • M110 Spring installed
  • Electronic trigger

For those who like to build their own AEG, and for those with a dead gearbox who aren't up for the fiddly and often frustrating process of repairing it and putting it all back together, this one is for you! This Specna Arms Complete reinforced Gearbox is a version 2 pattern gearbox designed for use in M4/AR15 AEG replicas.

£149.99
  • 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 rear/top wired AK platform replicas, which is jammed packed with aftermarket parts and features to ensure top-tier performance.

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 Airsoft bushings and bearings, pistons, receivers and more. We even have parts for gearboxes, including a wide range of Airsoft gears of different ratios.