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all the energy in your mechbox comes from your spring. the piston is only a vessel for transmitting that energy ultimately to the bb, but alot still makes it to your mechbox anyway.the weight difference between aluminum and polycarb in the whole scheme of things is small and at 15 rnds/sec would hardly be noticeable. my only issues with aluminum as a piston material is due to its relative softness and they tend to show wear marks easily, which also increase over time. don't get me wrong though, some guys use them with good success and i've used them too, but polycarb is the best way to go from my experience.
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