they are twangy things from the factory ..having all that commotion against your cheekbone doesn't help.If it seems quiet, you did a nice job inside.
What pressure on the HPA QB? I'm a fan of light strikers to quiet and reduce gas use. I've run QB pcp's at 2000 psi on a striker 70% of stock weight with a delrin valve head. Factory spring, no shim. That's where I'd start.
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