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With the stock gearbox and upgraded barrel it shot @ 438-442fps with .2's
With the upgraded gearbox it now only shoots at 325 most likely due to the shorter piston course as the sorbo pad is interfering.
The stock spring is said to bay an m120 spring, I'ld like to get closer to 400, such as 370-390.
Can somebody suggest what the very best spring for that job would be ? m130 ? If so, what brand ?
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