I've been using the stock motor in my ICS M4 with a 9.6v 1700 mah battery for about 2 years and have not had a single issue with it. This is with a PDI 150% spring as well.
I put a Guarder 2003 ver. outter barrel on mine and it is very heavy. Weighed about the same as a friend's RPK (until he put his NV on :P)
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