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In my experience, it's R.O.F VS Spring pressure! I us 120 springs in just about all my and my son's AEG's, using Li-po's or 10.8 batteries, even the best poly pistons only last a couple/three games, using 8.4 or 9.6 and you keep your bursts to 5 or 6 rounds, you could get 8-10 games or the hole season?
but more often than not, the first tooth will break off in short order.
I now use aluminum pistons, "they" wont break but, other parts might? metal on metal dose wear faster, also the piston wearing on the gear box is not good either (this piston you show here would not wear the gear box due to the body being poly)
We have and still do use the deep fire pistons, I used one in a 120 springed CA, it worked great fro about 2 games then the steel teeth rail broke through the front of the piston (hence weak point) I understand they have a new version out now?? but I am skeptical to try an other deep fire in an AEG, my son is running this piston in his SL-9 with shooting 480FPS it has lasted many many games but again, this is semi-auto fire!
110 springs an a 9.6 battery with poly pistons seem to be the best of power and reliability, going into the 120 and higher springs with a higher rate of fire is pushing the limits of most if not all poly pistons (this in my opinion and experience with many many gear box builds and break downs, in other words learning the hard way)
hope this helps.
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