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Ships within 48 hours · Estimated delivery Aug 10 - Aug 15
Made from 7075 aircraft-grade aluminum — lightweight and extremely durable
improving gearbox efficiency and extending the service life of your internal components
streamlined profile for improved handling and aesthetics
low battery warning
Compact design for easier installation in AK receivers
RetroArms AEG Spring SiCr with Progressive Winding – M150 Blowback Units Made from 7075 aircraft-grade aluminumThe 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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