MadBull Non-Linear Spring Upgrade M140 ( 450 to 470 FPS) for Metal AEG Gearboxes


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MADBULL NON-LINEAR M140 Upgrade Spring

  • FPS Rating: 440 to 470 FPS w/ .20g
  • For Use With AEG Airsoft Guns w/ Metal Gearboxes
  • Variable Pitch Spring Non-Linear
  • Mathematically Calculated Design for Best Consistency
  • Tested and Rated for over 100000 shots
  • Color Coating Protects from Environmental Wear and Tear
  • Made From Super High Grade German Piano Wire

The Madbull Non-Linear M140 Upgrade Power Spring is made from high quality German piano wire and tested to withstand over 100000 shots without losing power. The non-linear design allows for consistent FPS over the life of the spring compared to traditional style airsoft springs. It is highly recommended that you also upgrade to metal bearings, metal spring guide, polycarbonate piston and other components as needed when using this spring to prevent malfunction and damage to your gearbox.

Warning: We at recommend all upgrade / repair parts are installed by a professional as additional upgrades and/or custom fitting may be required. It is the responsibility of the customer to ensure the part is compatible with their gun prior to purchase. We are not responsible for any damage caused during or after installation and are installed at customer?s discretion.

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    1 Reviews

  • Posted by Noah Hebert on May 31st 2013



    Going to be useing this to make upgrades