The RetroArms AEG Spring SiCr M150 is a high-power upgrade spring crafted for serious airsoft builds that demand maximum muzzle velocity and spring strength. Made from Silicon-Chromium (SiCr) alloy steel, this M150-rated spring delivers outstanding durability, resistance to fatigue, and reliable FPS output under heavy tension.
Its progressive winding design ensures a smoother start during compression, reducing initial stress on gears and motor while still achieving high power output. Perfect for DMR and sniper-style AEG builds, this spring is recommended only for reinforced gearboxes with high-end internal components.
Features
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M150 spring rating – typically outputs ~470–500 FPS with 0.20g BBs (may vary by setup)
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Constructed from SiCr (Silicon-Chromium) spring steel for extreme durability
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Progressive winding for reduced mechanical strain and smoother compression
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Designed for long-range, high-power AEG builds (DMR/sniper role)
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Excellent fatigue resistance and long-term spring stability
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Manufactured in the Czech Republic by RetroArms
Specifications
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Material: Silicon-Chromium (SiCr) Spring Steel
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Rating: M150
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Type: AEG Main Spring
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Winding: Progressive
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Compatibility: Most reinforced 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 M150 (Progressive Winding)
Important Notes
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M150 springs are not recommended for standard gearboxes
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Requires reinforced internals, strong motor, and reliable compression setup
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Intended for advanced techs and DMR-type builds
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Professional installation is strongly advised
Disclaimer
⚠️ This product is an upgrade part intended for toys only. Not for real firearms.
