IMO, one's best bet is to wait for KWA's updated CZ75. It will benefit from an updated gas system from the old KSC CZ75, as well as improved metal externals.
Hunting down a KSC CZ75 and a Prime metal kit for is probably more trouble and money than it's worth, and will end up taking longer.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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