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see airsoftmechanics.com for lots of good info on trick setups (and the original designer of the extreme-fire mosfets is Gandalf on that forum). Caution...the info on it is very detailed/technical at times...it'll make your brain bleed...
I've had good luck with Modify Polycarbonate full tooth pistons. The supercore piston is supposed to be very good as well.
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