Guarder Tune-Up AEG Spring

  • For Airsoft AEG
  • Great Spare Part
  • Wide Range of Powers

A replacement spring for your Airsoft AEG weapons.

Full description


The perfect spare springs for those who modify their weapons, or for those who have a weapon which is too hot to use and requires downgrading.


  • A wide range of Springs, for various applications
  • High Powered Springs for DMR and Dual Sector Gear Setups
  • Low Powered Springs for CQB and low power AEG Setups
  • Mid Power Springs for Gun Downgrades and Upgrades

Package Includes

  • Tune-Up AEG Spring

Special Instructions

The Springs approximate power can be shown by selecting a Spring Type from the top right of the screen which will update the Product Specification.

To work out the power of the spring you require please refer to the SP (Spring Power) Rating of the spring, this is the approximate power in M/s as defined by the manufacturer. Please note, that this can vary dependant on the setup of your gun, as a weapon with an extremely good Air Seal can be higher than the rating, and a weapon with a bad Air Seal or Wide bore Barrel can see this drop. 

To work out what FPS the chosen spring should approximately produce you first need to convert the 'SP (Spring Power)' rating from M/s to FPS. To do this you can use the following formula:

SP Rating x 3.28 = SP Rating in FPS, eg. SP100 x 3.28 =  ~328FPS

Please note, that only Standard SP rating spring should be used in normal Airsoft AEG, such as springs up to a max of SP-110, as values over this can make your weapon too powerful and fall foul of UK Gun Laws. Please ensure that the higher power springs are only installed on DMR Rifles (SP-120 Max), and Sniper Rifles which use AEG Springs (SP-150 Max), and any other High Powered Spring should only be used in Dual Sector Gear gun setups which require High Powered Springs, though fire under 350fps.

If you are unsure on what power spring you require please feel free to give the shop a call on: 01484 644709 and talk to the Workshop about your options, or ask the community via TokyWoky at the bottom right of every page.



Parts & Accessories Type
Internal Parts
Internal Part Type
Patrol Base - Warning Icon
Patrol Base - Warning Icon
Parts Fitting
Name Variant
SP-85 , SP-90 , SP-100 , SP-110 , SP-120 , SP-130 , SP-140 , SP-150 , SP-160 , SP-170 ,


Internal Part Construction

Part Specific

Part for Power Source Type

Spring Specific

Spring Manafacturer Power Rating
Approx. M-85, Approx. M-90, Approx. M-100, Approx. M-110, Approx. M-120, Approx. M-130, Approx. M-140, Approx. M-150, Approx. M-160, Approx. M-170,
Spring Approximate M/S
Approx. 85m/s, using 0.20g BB, Approx. 90m/s, using 0.20g BB, Approx. 100m/s, using 0.20g BB, Approx. 110m/s, using 0.20g BB, Approx. 120m/s, using 0.20g BB, Approx. 130m/s, using 0.20g BB, Approx. 140m/s, using 0.20g BB, Approx. 150m/s, using 0.20g BB, Approx. 160m/s, using 0.20g BB, Approx. 170m/s, using 0.20g BB,
Spring Approximate FPS
Approx. 278fps, using 0.20g BB, Approx. 295fps, using 0.20g BB, Approx. 328fps, using 0.20g BB, Approx. 360fps, using 0.20g BB, Approx. 393fps, using 0.20g BB, Approx. 426fps, using 0.20g BB, Approx. 459fps, using 0.20g BB, Approx. 492fps, using 0.20g BB, Approx. 524fps, using 0.20g BB, Approx. 557fps, 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.