Madbull Airsoft AEG Upgrade Spring

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Calculated carefully by computer and test by 100000 times punching. Our spring has been proofed that the length and force are still consistent. (See here) We just want to proof that our spring is not just a "spring". It is a MadBull spring and it is "colorful." Other features:Consistent >100000 shotsl Non-liner design (calculated)Color coating to reduce effects from environmentDesign & Made by experienced engineers.Premium quality German piano wire

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