I've hard some problems with my MP5 hicaps (I know, not related but they work the same way), one needed to be taken apart and have the gears lubed up (it was misfiring a lot), the other wouldn't feed the BBs to the top of the mag (turned out to be a single garin of sand lodged in between the teeth of one gear.) Just pointing that out for hicap maintaintance sake.
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