Airsoft Gearboxes

If you have had a gearbox failure and you don't fancy opening it up, the CYMA Complete Version 2 Gearbox w/High Torque Motor & ETU is a pre-upgraded and pre-wired replacement which can be installed with minimal effort and no need to solder or open the gearbox shell. As always, we recommend you have some technical experience before installing a new gearbox, but when it comes to Airsoft upgrades this is about as easy as they get.

This gearbox set is designed for M4/AR-15 AEGs and has the correct nozzle length and selector plate for the task and is also pre-wired to a Deans connector so you can benefit from a lower resistance connector for increased electrical efficiency. Also included with the set is a CYMA high torque Neodymium magnet motor, providing a very snappy trigger response and the power to handle stronger springs than a standard motor.

The icing on the cake is the pre-installed MOSFET/ETU which prevents gearbox lock-up on semi-auto, provides further improvements to the trigger response and a boost to the rate of fire. If your M4 gearbox has issues or you want to freshen up an old M4 with a brand new and pre-upgraded gearbox this set would be a fantastic choice, avoiding the messing around and getting you back to shooting with minimal effort!

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!

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.

Whether you are upgrading your SMG-5 or repairing it, the CYMA CM.041G/CM.041H Complete Gearbox E-Edition High-Speed is a great excuse to do both at the same time! This gearbox is a Version 2, designed for CYMA CM.041 series SMG-5 AEGs but should fit most SMG-5 AEGs on the market (not SMG-5K) and also includes a high-speed motor of the long shaft variety.

As the heart of the CYMA E-Edition High-Speed Platinum AEG series, this gearbox is absolutely packed with upgraded parts. Highlights of the internals include the CYMA MOSFET/ETU system, steel high-speed 13:1 ratio gears, an aluminium silent piston head and cylinder head and a quick change spring system. Being a replacement original parts set, this gearbox is the exact setup found in the superb CM.041G and CM.041H AEGs, meaning if you have ever been envious of their performance you can now make your SMG-5 shoot just as nicely!

If you are looking for a high end gearbox shell to start your ultimate AEG build, stop looking, you found the best there is! The Gate EON gearbox shell is CNC machined from 7075 aluminium for a strong and lightweight gearbox with a plethora of small enhancements that make this gearbox a dream to put together.

The cylinder window is radiused on all corners and the shell has some significant reinforcements at the front end, and along the top spine. The internal wire routing has been redesigned for ease of installation, and the shell is perforated with several inspection windows so you can set your angle of engagement, adjust your pre-cocking settings and shim your gears perfectly. Is this the ultimate Airsoft gearbox? Well, it will be, once you've built it!

If you are looking for a high end gearbox shell to start your ultimate AEG build, stop looking, you found the best there is! The Gate EON gearbox shell is CNC machined from 7075 aluminium for a strong and lightweight gearbox with a plethora of small enhancements that make this gearbox a dream to put together.

The cylinder window is radiused on all corners and the shell has some significant reinforcements at the front end, and along the top spine. The internal wire routing has been redesigned for ease of installation, and the shell is perforated with several inspection windows so you can set your angle of engagement, adjust your pre-cocking settings and shim your gears perfectly. Is this the ultimate Airsoft gearbox? Well, it will be, once you've built it!

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. 

If your M4 needs a revamp, a new gearbox is the easiest way to do it. The Delta Armory Complete Version 2 Gearbox for M4/AR-15 AEG is compatible with almost every M4/AR-15 AEG on the market and is well-equipped with reinforced parts straight out of the gate. 

This is the same gearbox used in the Delta Armory CHARLIE™ line AEGs, boasting a quick change spring guide, 18:1 steel gears running on 7mm bushings, an SHS piston with a full steel tooth rack, an SHS reinforced tappet plate and a reinforced gearbox shell with radiused cylinder window corners. 

The pre-installed spring will provide around 380 FPS when installed, so if you plan to use this gearbox for anything other than a semi-auto-locked DMR build you will need an M100, M105 or weaker spring to keep it within site limits. Thankfully, the quick change spring system makes spring swaps a breeze! Whether you are breathing new life into an old M4 AEG or you are building an AEG from scratch, this complete gearbox will save you loads of time and messing around!

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.

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.

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!

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.

If you're looking to revamp your old SR25 why not take a walk on easy street and replace the whole gearbox? The CYMA CM.098 SR25 V2 Long Gearbox Set w/Motor is the exact gearbox used in their CM.098 SR25 series and should be compatible with Classic Army style SR25 AEGs which use the version 2 long gearbox (Classic Army, CYMA and A&K). This gearbox is well equipped, and includes a MOSFET/ETU prewired in, a quick change spring system, an M130 spring and also includes a high torque Neodymium magnet motor. Perfect to fix up an old big boy AR!

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!

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

If you are worried about trapping your wiring when inserting a magazine or reinstalling your MCX handguard, Laylax has once again come up with a solution! The Wire Guard for MCX AEG is designed to mount to the gearbox shell and keep your wires well out of the way of any snags or potential damage from inserting magazines or removing/reinstalling the handguard. If you want to get ahead of one of the known problem areas of the MCX and save yourself some hassle down the line this affordable upgrade could save you time and money!

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!

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!

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! 

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.

If you have an old AK AEG that needs a revamp, Specna Arms has just the thing! The Complete Reinforced Gearbox V3 boasts a wealth of pre-upgraded components, a quick change spring guide, and a microswitch trigger unit. If you aren't a fan of going inside gearboxes to solve issues this will suit you well as this version 3 gearbox is pre-built and ready to be installed in your AK AEG; all you need to add is a motor and motor cage!

If you have an old AK AEG that needs a revamp, Specna Arms has just the thing! The Complete Reinforced Gearbox V3 boasts a wealth of pre-upgraded components, a quick change spring guide, and a microswitch trigger unit. If you aren't a fan of going inside gearboxes to solve issues this will suit you well as this version 3 gearbox is pre-built and ready to be installed in your AK AEG; all you need to add is a motor and motor cage!

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!