$10.00 GST included
17 in stock
Overview
The ZWQ S400 2 mm Upgrade Spring is a factory-style performance upgrade designed for users looking to increase output while maintaining the S400’s smooth, reliable shooting characteristics. It offers a noticeable boost over the stock spring without turning the blaster into an unstable or difficult-to-prime setup.
Updated 2/04/2026: The appearance of this spring is only slightly better than the ones I custom-ordered from a spring factory (for 3D-printed launchers), but this is indeed an original ZWQ factory spring.
Key Features
2 mm wire diameter for increased power compared to the stock spring
Provides a clear FPS increase while retaining consistent firing
Designed to work with the S400’s internal layout without major modification
Suitable for players who want stronger performance without extreme tuning
Compatibility
ZWQ S400 Zebra Blaster
Compatible with standard S400 internals and factory components
Performance Notes
This spring is intended as a balanced upgrade, not an extreme competition spring.
Actual FPS will vary depending on seal quality, barrel setup, and dart type.
Recommended for experienced hobby users who understand spring-powered tuning.
Installation Notes
Installation requires basic disassembly
Eye protection recommended during installation
Not intended for children or casual toy use
