If I were you, stick with a 110m/s spring and keep your motor. Stick to standard ratio gears and you can get a battery as large as 2300mah like Tankdude has. It should give you a decent ROF and last for more than a couple of mags. Prometheus springs can sometimes be overachievers as my MS100 in an M4 shoots 370FPS with .2 and 345 with .25.
Torque gears will give a more efficient use of battery current, but at the expense of ROF.
It sounds though like you want it all, 420 FPS at 900+ rpm out of an AUG and you just can't have it, unless you go external with your battery.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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