The RetroArms AEG Spring SiCr M120 is a high-performance upgrade spring designed to deliver consistent FPS output, smooth compression, and long-lasting reliability. Made from Silicon-Chromium (SiCr) alloy steel, this spring offers enhanced durability and resistance to fatigue, even in high-RPS setups.
Its progressive winding design ensures a gentler initial compression for smoother gearbox operation and reduced stress on internal components, while maintaining full power toward the end of the cycle. Ideal for players looking to build around the M120 power range for a balance of performance and reliability.
Features
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M120 spring rating – typically delivers ~390–410 FPS with 0.20g BBs (results may vary by build)
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Made from high-grade SiCr (Silicon-Chromium) spring steel
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Progressive winding design for reduced startup resistance and smoother cycling
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Consistent tension and excellent resistance to fatigue
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Suitable for high-speed or high-torque AEG builds
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Manufactured in the Czech Republic by RetroArms
Specifications
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Material: Silicon-Chromium (SiCr) Steel
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Type: AEG Main Spring
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Rating: M120
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Design: Progressive winding
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Compatibility: Most standard AEG gearboxes
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Brand: RetroArms
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Origin: Czech Republic
What’s Included
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1x AEG Spring SiCr M120 (Progressive Winding)
Important Notes
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Final FPS depends on cylinder volume, barrel length, air seal, and other variables
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Professional installation is recommended for spring changes
Disclaimer
⚠️ This product is an upgrade part intended for toys only. Not for real firearms.
