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your problem there is in the battery, G&P M4's seem to favoure the 9.6v batteries. I suggest finding one and trying that before blaming the problem on the internals. If a 9.6v battery works, i suggest the 9.6v 1700mah nun-chuck battery. that will fit perfectly into the handguard and 1700mah is more then enough for a full day of use.
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