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Is This Normal?
I installed a bunch of Prometheus parts in my SIG 552 gearbox, including a cylinder head, aluminum piston head, hard piston, MS110 spring, and smoother spring guide. I probably didn't even fire more than 500 rounds with the new setup, but when I took my gearbox apart the other day, I noticed that some of the rubber on the pad on the cylinder head had been chipped away or rubbed off extremly hard. Is this supposed to be normal? I did fire most of the shots dry, cause I was testing my MOSFET switch. Could that be the cause?
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