These upgrade springs are manufactured by Guarder. They are non-variable pitch springs (read our Guide To Upgrade Springs to learn what a variable pitch spring is). These springs of for Airsoft AEGs and not spring airsoft guns or airsoft sniper rifles. Below are approximations of the FPS you may receive from Guarder springs. Setups will vary so we can't guarantee the FPS your AEG will achieve.
- Guarder SP85 Spring: 280 FPS
- Guarder SP90 Spring: 295 FPS
- Guarder SP100 Spring: 330 FPS
- Guarder SP110 Spring: 360 FPS
- Guarder SP120 Spring: 390 FPS
- Guarder Sp130 Spring: 430
- Guarder SP140 Spring: 460 FPS
- Guarder SP150 Spring: 490 FPS
- Guarder SP160 Spring: 520 FPS
- Guarder SP170 Spring: 560 FPS
Approximate FPS Of Guarder Springs
If you are using an SP110 guarder spring or greater, you may also need other upgrades. Be sure that your gearbox has the proper upgrade parts for the strength of your spring. If you are looking to downgrade the FPS of your AEG, you can purchase the SP90 or SP85 Guarder spring.