Could also be caused by a sticky hop up rubber. Have you evern put a drop of so of silicon oil in the feed nozzle? I've found that the rubebr gets sticky once in a while, causing misfires.
Might not be a bad idea to put enough BBs to fill the mag, into a bowl, put a few drops of silicon oil on them and mix. Then load all those BBs into your mag. That'll get a bit of oil all around the inside of the mag, might ease the misfiring issue as well.
Would help if you say what mag you bought for it, brand and lo/mid/hi.
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