CYMA CM.098 SR25 V2 Long Gearbox Set w/Motor

Code: FBP4142
  • MOSFET/ETU Pre-installed
  • High torque motor included
  • Version 2 Long Gearbox - For SR25

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!

Full description


The CYMA CM.098 SR25 V2 Long Gearbox Set w/Motor is intended as a drop in replacement gearbox for SR25 AEGs which use the version 2 long gearbox. This gearbox is the same provided in the CM.098 series and has an alloy shell with radiused cylinder window to reduce stress when used at high FPS.

The gearbox includes CYMA's basic MOSFET/ETU which is pre-wired in and reinforced steel gears which run on 8mm ball bearing bushings for super smooth running. As a bonus, the set includes a high torque motor with Neodymium magnets which should give an impressive trigger response when installed.

This gearbox is compatible with the CYMA CM.098, and should also work in other SR25 AEGs which use the V2 Long gearbox type (A&K, Classic Army). This gearbox is not suitable for a normal M4, or the G&G or Ares pattern of SR25 as they use standard version 2 gearboxes.


  • Alloy gearbox shell
  • Steel gearset
  • 8mm Bearing bushings
  • MOSFET/ETU inside
  • M130 spring pre-installed
  • Quick change spring guide
  • Rear wired - Deans connector
  • Ambidextrous selector compatible
  • Complete gearbox - Drop-in installation
  • Cylinder windows radiused to reduce stress
  • NOT compatible with standard M4/AR15
  • Anodised aluminium cylinder - Reduced friction
  • Only for Classic Army pattern SR25 (CA, CYMA, A&K)
  • Not compatible with G&G / Ares / JG SR-25
  • High torque Neodymium magnet motor included

Package Includes

  • CYMA CM.098 SR25 V2 Long Gearbox Set w/Motor



Internal Part Type
Complete Gearbox
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.697kg


Colour Wheel Greyscale
Item Colour
Matte Silver
Construction Icon
Alloy shell with steel gears, polymer nozzle and piston, aluminium cylinder.
Internal Part Construction
Polymer, Alloy, Steel, Aluminium,

Part Specific

Part for Power Source Type
Weapon Platform
  • AR Platform
  • Long Gun
  • Assault Rifle
  • Classic Army pattern CA25/SR25
Package Includes
  • Complete Gearbox
  • Motor

Electric Part Specific

Gearbox Version Compatibility Variant
SR-25 Rifles

Spring Specific

Spring Manafacturer Power Rating
Approx. M-130
Spring Approximate M/S
Approx. 130m/s, using 0.20g BB
Spring Approximate FPS
Approx. 426fps, using 0.20g BB

Bearing Specific

Spring Guide Bearings

Motor Specific

Airsoft Motor Icon
Motor Type
High Torque
Motor Shaft Length
Motor Pinion Type

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.