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Ships within 48 hours · Estimated delivery Aug 12 - Aug 17
Manufactured from Silicon-Chromium (SiCr) spring steel
Developed in collaboration with SpeedQB
reliable BB feeding
this blowback unit offers unmatched durability and reduced weight
Cylinder Type: Type C (for 300mm–400mm inner barrel length)
RetroArms SR25 Spring SiCr with Progressive Winding — M140 Trigger Guards Manufactured from Silicon-Chromium (SiCr) springThe RetroArms SR25 Spring SiCr with Progressive Winding M140 is a high performance main spring designed for SR25 and extended gearbox builds that require powerful and consistent compression. Manufactured from silicon chromium (SiCr) alloy steel, this spring offers superior resilience, reduced fatigue, and long term stability compared to standard carbon steel springs. The progressive winding design ensures smoother compression, reducing stress on the
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