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ensuring stable compression and consistent FPS output
M150 spring rating – typically outputs ~470–500 FPS with 0
aggressive look for your build
Professional installation is recommended for optimal performance
Ideal for high-performance
RetroArms AEG Spring SiCr with Progressive Winding – M130 Receivers ensuring stable compression and consistentThe RetroArms AEG Spring SiCr M130 is a precision engineered upgrade spring built for high performance AEG builds. Constructed from Silicon Chromium (SiCr) steel, this spring is designed to provide stable FPS output, excellent resilience to fatigue, and long term durability, even under extreme gearbox stress. Its progressive winding design allows for smoother compression at the start of the cycle, reducing stress on gears and motor, while delivering
