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When I was researching gearbox's before I came to the conclusion that the zinc alloy was my best bet. I only shot no more than 5000 shots if that and the temperature was always in the 80's. It's got the standard Hurricane cylinder kit with an airsoft surgeon stage 3 spring. Also a standard half tooth piston. My buddy has the same style hurricane kit in his AK and has never had problems shooting at 400fps.
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