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Some magazines over time and use develop worn areas on the plastic surfaces the bb's move along, this can cause a bb to bind and the spring tension forces the double stack design to overlap the bb's causing a jam
Another cause is fatigue of the threads that hold the two halves of the inner shell together and can sometimes strip or they have been stripped by over tightening
The third cause is flexing of the plastic if left loaded as you mentioned
I would be careful spraying a silicone inside because this may do two things, one it will cause your hop to be inconsistent and two the oil will attract dirt
It was designed to work dry so if you separate the shell wipe it out and look for dull areas, bb's prefer to move along a mirror smooth surface for optimal feeding and performance
When reassembling use caution on the tightening because they strip out easy
And don't use loctite because it will eat the plastic
If it continues and pisses you off buy new mags
I hope it helps
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