try a bigger battery. sounds like your's doesn't deliver enough current to start the motor under load (spring partially compressed). 9.6v 1000mah is too small for that gun. you should be using at least a 1700 mah battery or even bigger. if a larger battery won't turn it over, then the odds are your mechbox is seized up, but not likely. the sector gear and/or piston would have given way if that's the case, however you won't know for sure until you try a bigger battery. there are very few m4 variants that will run on a battery that small, but your gun isn't one of them.
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