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best upgrades for those krakens is some preventive maintenance so that strong 370fps spring doesnt kill your box, so change out the nylon bushings for metal ones, and a shim job and re-grease and your good as far as the gearbox goes.
only other internal improvement would be the inner barrel and hop-up assembly in order to improve accuracy
next its the external upgrades, metal body, wood grips etc. and you are set
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