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never heard of this problems before but the double torque ups are what i use in my M249, by far the highest quality gears i've ever seen.
I had to punch out the pin for the tappet plate on the sector gear and replace it with the wider G&P pin that holds the tappet open longer, never saw any sign of the gears wanting to come apart, so try punching them back together, shoot a few times and check if its coming apart or not.
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