The RetroArms AEG Spring SiCr M140 is a heavy-duty upgrade spring engineered for high-powered AEG builds requiring maximum performance and consistency. Manufactured from Silicon-Chromium (SiCr) spring steel, it offers exceptional durability, resistance to deformation, and long-lasting elasticity under intense mechanical stress.
Its progressive winding design starts with a lighter compression rate and increases toward the end of the cycle, reducing wear on gears and motors while still delivering powerful FPS output. This M140-rated spring is ideal for DMR-style setups or long-barrel builds aiming for high muzzle velocity.
Features
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M140 spring rating – typically delivers ~450–480 FPS with 0.20g BBs (results vary per build)
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Constructed from SiCr (Silicon-Chromium) spring steel
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Progressive winding reduces initial resistance and extends spring life
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High-tension spring built for extreme durability and consistency
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Ideal for DMR builds, sniper-style AEGs, and long inner barrel setups
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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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Type: AEG Main Spring
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Rating: M140
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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 M140 (Progressive Winding)
Important Notes
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M140-rated springs exert high pressure and require reinforced internals, strong motor, and reliable compression system
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Not recommended for stock gearboxes
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Professional installation highly recommended
Disclaimer
⚠️ This product is an upgrade part intended for toys only. Not for real firearms.
