RetroArms AEG Spring SiCr with Progressive Winding – M150 Blowback Units Suitable for a wide range

Suitable for a wide range of BB weights and outdoor or indoor airsoft gameplay

Compact design for easier installation in AK receivers

Color: Titanium (anodized finish)

streamlined profile for improved handling and aesthetics

Professional installation recommended for competition setups

RetroArms AEG Spring SiCr with Progressive Winding – M150 Blowback Units Suitable for a wide rangeThe 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