ASG Ultimate Mil-Spec AEG Spring

  • Progressive Coiling
  • Coloured Rating Tip
  • SiCr Zinc Coated Steel

Produced to an incredibly high quality with the best mil-spec steel rated SiCr. Every spring no matter the rating has gone through a full quality control test by ASG for your peace of mind that you are fitting a reliable spring. 

Full description


Ideal for a basic, high FPS or high Rate Of Fire as long as your chose the right spring rating for your Airsoft electronic gearbox build. Each spring is Zinc coated to deter corrosion without impairing performance. The front of the spring is also coloured to identify the power rating and which end goes into your piston upon assembly.


  • Coloured end identifies power rating and which end goes into your piston (front)
  • 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 result in a smooth initial piston release limiting stress on internal components
  • Side bending is reduced due to materials and finish
  • Excellent for high rate of fire builds
  • Black Zinc plating to limit corrosion without impairing spring performance
  • Check out this Guide if you are unsure what spring you need

Package Includes

  • ULTIMATE Mil-Spec AEG Spring



Parts & Accessories Type
Internal Parts
Internal Part Type
Name Variant
M95, M105, M125, M135, M115,


Colour Wheel Greyscale
Item Colour
Red, Orange, Blue, Green, Yellow,

Part Specific

Part for Power Source Type

Spring Specific

Spring Manafacturer Power Rating
Approx. M-95, Approx. M-105, Approx. M-125, Approx. M-135, Approx. M-115,
Spring Approximate M/S
Approx. 95m/s, using 0.20g BB, Approx. 105m/s, using 0.20g BB, Approx. 125m/s, using 0.20g BB, Approx. 135m/s, using 0.20g BB, Approx. 115m/s, using 0.20g BB,
Spring Approximate FPS
Approx. 311fps, using 0.20g BB, Approx. 344fps, using 0.20g BB, Approx. 410fps, using 0.20g BB, Approx. 442fps, using 0.20g BB, Approx. 377fps, 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.