FPS Softair AEG Upgrade Spring

  • Progressive Coiling
  • For AEG replicas
  • Reduces piston stress

Upgrade your stock AEG spring with a Softair's range of high-quality carbon steel springs for superior performance that may give you an edge in gameplay and improve your replica's reliability.

Constructed from burnished and pre-hardened carbon steel wire, the spring also has the addition of silicon and chromium for improved tensile strength and to reduce friction to reduce energy loss. It is recommended to use the spring in association with spring guides and bearing piston heads to ensure maximum performance and durability. The spring also features closed and flattened top and bottom ends to improve stability, with the spring also reducing stress on your replicas pistons due to the non-linear design.

Available in various strengths providing roughly 300, 345, 360 and 395 FPS respectively.

Full description



  • Consistent power with minimum loss between each shot
  • Excellent coil strength
  • Closed and flattened top and end for improved stability
  • Designed with 6.03mm Inner barrels in mind
  • Progressive coils with smooth initial piston release limit internal stress
  • Side bending is reduced due to materials and finish
  • Excellent for high rate of fire builds

Package Includes

  • FPS Softair AEG Upgrade Spring



Internal Part Type
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting
Name Variant
100m/s, 105m/s, 110m/s, 120m/s,

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.02kg
Product Length
Approx. 17cm


Colour Wheel Greyscale
Item Colour
Construction Icon
Internal Part Construction

Spring Specific

Spring Approximate FPS
Approx. 325fps, using 0.20g BB, Approx. 340fps, using 0.20g BB, Approx. 360fps, using 0.20g BB, Approx. 390fps, using 0.20g BB,

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.