- FPS Rating: 440 to 480 FPS w/ .20g
- For Use With AEG Airsoft Guns w/ Metal Gearboxes
- Variable Pitch Spring
- Made From High Carbon Steel
The G&G M140 Upgrade Power Spring is made from high quality carbon steel which insure this spring will hold up for a long time! The variable pitch spring design means that it will provide a consistent FPS over the life of the spring and is less susceptible to being worn in like traditional springs. It is highly recommended that you also upgrade to metal bearings, metal spring guide, polycarbonate piston and other components as needed when using this spring.