Pay in 4 interest-free payments of $92.50 Learn more
Ships within 48 hours · Estimated delivery Aug 13 - Aug 18
this upgrade part offers a stylish
low battery warning
improving gearbox efficiency and extending the service life of your internal components
Professional installation recommended for competition setups
Professional installation advised for best results
RetroArms AEG Spring SiCr with Progressive Winding – M150 Blowback Units this upgrade part offers aThe 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
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