kwa generally has more factory upgrades done to the gun(metal slide, metal barrrel, hi flow valves, etc.), but has no trademarks. ksc is usually stock(plastic ) but with trademarks. trademarks might not matter to some people, and it might matter to some people. personally, i would rather have the gun that can take green gas safely out of the box(which in this case would be the kwa gun).
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