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haha had the same issue with my G&G UMG... had a systema hopup ruber lying around in my parts box, and swaped the G&G one for the systema one...
Overhop was reduced.. but still needed .25 to shoot straight...
but IMO, they did that, so you use heavier ammo, to compensate the REALLY short barrel of the UMP....therefore getting better groupings...
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