Modify's upgrade springs are manufactured from A class piano wire for strength and durability. Irregular pitch coiling for enhanced performance. Very Consistent FPS. Easy to install. Every spring has gone through vigorous and Sophisticated quality tests from the moment a new design leaves the software drawing through to final mass production.
- Down or Upgrade Airsoft AEG's FPS to 270-280 Range
- Upgrade to Metal Bushings & Guide Rod Recommended
- Compatible with most AEG (Marui, ICS, Classic Army, etc.)
- Any Internal upgrades will void warranty