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Personally I find that theres nothing wrong with stock, as long as the spring your running isnt to strong. As just a suggestion, a prometheus piston is a great quality piston, however it can run you a small chunk more than other companies. Other options are systema and modify to name a few, some people have stated that the systema polycarb red is a terrible piston. There is a thread about it somewhere on here, however I have never had any issues with the systema red and have run set ups ranging between 280FPS all the way up to 480FPS without issue.
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"Its only a little bit on fire"
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