Just thought of this, could it be a bad mag catch? Maybe try a few to see if it is too low? I would think that if the catch were a bit low it would allow the mag to drop down enough to cause a problem? Measure the distance from the top of the mag to the hole on all mags to see if they are the same.
My .02
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Suppose you were an idiot.....and suppose you were a member of Congress.....But I repeat myself" ~~ Mark Twain
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