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You just opened the timing can of worms Hazard! Actually, as long as you keep the toothed section of the sector gear well away from the piston, the gun will work no problem.
Am not sure the brand of 110 spring he installed, but I have a Prometheus 110SP in my other MP5, and both my Intellect NiMH 8.4V 1400mAh and my Sanyo NiCad 8.4V 600mAh mini will cycle it just fine.
As for the problem at hand, I'm gonna have to think about it, sounds like either the spring is a Guarder or Systema and is too strong for the battery, the battery needs to be charged, or the mechbox was put together wrong (such as the piston grooves aren't sitting in the rails or something.)
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