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If you don't have access to a hammer spring right now, one thing you can do is to take the spring out, place a BB at the bottom of the spring chamber and reinstall the spring. It will add enough preload to act like a 150% hammer spring.
I've done the stock valve modifications on a KSC valve before and it didn't do anything. It performed the same as if it were stock. I don't know how that would work with a Marui valve.
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