Hammer Spring Upgrade for Power Tuning
FX Impact Tuning Hammer Spring
Overview
The FX Impact Tuning Hammer Spring is designed specifically for the FX Impact MKI, MKII, M3 and M4 air rifles. It features a stiffer, higher-power curve than the factory spring, giving you greater performance and fine-tuning flexibility — especially when upgrading for slugs or hybrid slugs.
Key Features & Benefits
- Custom designed for FX Impact (MKI / MKII / M3 / M4).
- Higher power-curve than the stock spring for more tuning range.
- Perfect for slug and hybrid slug setups.
- Pairs ideally with Huma-Air valve return spring for best tuning results.
- High-quality steel construction and worldwide shipping.
Tuning & Usage Notes
When upgrading from the factory spring, recheck your regulator pressure, transfer port, hammer weight, and valve settings to get the best results. Many shooters report increased velocity and improved consistency.
Compatibility
- FX Impact MKI
- FX Impact MKII
- FX Impact M3
- FX Impact M4
- All other FX Airguns
Legal Notice: Buyer is responsible for ensuring compliance with local airgun laws and regulations.
Shipping & Payment
- Worldwide shipping available.
- Secure packaging for safe delivery.
- Payment via major cards or PayPal
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Tags: impact, mk1, mk2, m3, m4, power, tuning, hammer, spring, huma air, slug, hybrid, upgrade