Modify M120 Upgrade Irregular Pitch Spring for AEG Airsoft Guns
The Modify M120 Upgrade Spring is designed to be used in almost any full metal airsoft AEG gearbox. This spring uses steel piano wire for maximum durability and reliability. The irregular pitch design reduces overall stress inside the gearbox.
- High quality steel construction
- 390-400 FPS with .20g BBs
- Reduces mechanical stress in gearbox
- Compatible with all Airsoft AEG gearboxes