Airsoft Electric Parts - Complete Gearbox

If your AK AEG needs a revamp, the ZCI Complete V3 Gearbox w/ Micro Switch for AK AEGs is the easiest way to give it a new lease of life. This is a complete version 3 gearbox fitted with an AK nozzle, selector plate and top cover retention latch, though if you run an AR36, SG55x or SMG-5K you can swap these parts out for your original bits and use this gearbox in your replicas too. 

Inside, we have an impressive set of internal parts including 18:1 CNC steel gears, 8mm bushings, a steel quick change spring guide, a polymer piston with a full steel tooth rack, a CNC steel cylinder and CNC aluminium piston and cylinder heads. The wiring is low resistance and fitted with a mini-Tamiya connector, wired to suit front-wired and top-wired AK AEGs. The trigger is the "micro-switch" type, improving trigger response and longevity when compared to conventional copper trigger contacts. 

Complete gearboxes are the easiest way to fix gearbox issues for those who are less technically confident or those who don't have time to fiddle with the internal parts of their pride and joy. Whether you've got an AK AEG to fix, are working on a custom build or want a gearbox to learn the technical aspects of the hobby, the ZCI Complete V3 Gearbox w/ Micro Switch for AK AEGs is a fine choice!

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!

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!

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.

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!

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!

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