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I have since sold the M249 but it was apperantly a bad O-ring on the piston. The previous owner had stripped the piston and replaced it with a systema aluminum one, I had CDN_Stalker check it all out and install the new wild monkey metal gearbox and he swapped the O-ring and it worked fine after that as far as I know. You can PM him I guess for any more details, I'm just going from what I remember of what he told me.
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