i agree. any internal modification that puts more stress on your gearbox will inevitably shorten its life-span, and of all the things you could upgrade, the spring will create the most strain on all the parts of your gearbox. that said, G&P does make some of the best reinforced boxes around, and the internal parts are already top quality so you should be fine. im pretty sure they design them to take a m120 anyways. i know lots of people who run 120's in G&Ps with no problems, including myself.
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