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I have seen that same problem with mp7's ( tm ) in my area. One solution that worked out quite well was to silicone spray the mag's spring then with some bb's in the mag,,wind it up,release it,( by hand )reload the mag and repeat. do this a few times then see if it works ( ** bb's used for this will now be junk since they will be lubed up ** ). Also try a couple drops on the feed catch spring on the top of the mag. I know it sounds dumb to lube the inside of the mag but try it to see if it works out,just dont soak the interior of the mag.
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