I can fit two mini 8.4v in the wifes M4 hand guards, as for the 9.6, I was running one in my CA M15 and ended up rounding off my pinion gear on my motor after only 6000rnds. Yes the rof was insane, was able to empty a Star 85rnd mag in like 3 seconds, and this was with an all aluminum piston/piston head, and a promethius MS120 spring.
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