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Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
Professional installation recommended for competition setups
Enhances gearbox efficiency and performance
this upgrade part offers a stylish
Compact design for easier installation in AK receivers
Suitable for a wide range of BB weights and outdoor or indoor airsoft gameplay
RetroArms AEG Spring SiCr with Progressive Winding – M150 Blowback Units Professional installation recommended for competitionThe 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
