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My ICS M4 started fucking up the same way - sputtering when firing - when I used an S120 and 7.4v Lipo 1000mah -it wouldn't happen right away but only after playing for a bit.
The issue was solved when I changed out the spring to an s110 and I was fine.
I find that the ICS stock motors are pieces of shit and the pinion strips way too easily - I use the JG Blue HighTorques with flawless performance in all my ICS AEGs.
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