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just to be aware, the RPM in auto is around 450rpm which is really slow. My WOC w/ steel carrier using stock recoil spring is 600, with RA-tech spring its 850.
You're gonna have to wait for CO2 mag or upgrade to RA-Tech bolt carrier group and recoil spring to have a good rpm.
I would also suggest getting RA-Tech hopup as it will allows you to adjust fps without taking the barrel apart (which requires AR armor's wrench + ~10 minutes.
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