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The pins are steel The wont crack.
Strip the gun down too often or put one in that's not properly lined up you may have an issue if you're unlucky.
2 main issues with KWA/KSC MP7s. Swollen hopup rubber from too much oil. Double feeds or a whole stack of BBs stuffed in the barrel. Nozzle damage or mashed return springs for the nozzle.
Otherwise for the average player they're Timex tough.
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Airsoft, where nothing is hurt but feelings.
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