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Double Eagle = smaller space for battery = smaller battery.
G&G = Space for 10.8v (kickass), all parts that should be metal, (bolt release, front sight, etc.), are available from G&G, dont know about compatibility with other brands, IF you go 10.8v, of course you have to upgrade your switch and you could potentially fry your motor.
STAR = I dont know, but its expensive. G&G is definitely good enough.
My two cents: Go G&G. Double Eagle, as you can probably imagine, is pretty shitty compared to the other options.
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