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and easy to install
Built from high-quality aluminum
1x CNC Aluminum Double O-Ring Ball Bearing AEG Piston Head
Designed specifically for NGRS (Next Gen Recoil Shock) gearboxes
1x AEG Spring SiCr M120 (Progressive Winding)
RetroArms AEG Spring SiCr with Progressive Winding – M150 Carbon Fiber and easy to installThe 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