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wait. OP, did you do the blue gasket sealant on the mags? I've only ever used sealant to seal the rear plate of the mag, similar to z0ng's DIY. did you use sealant around the feed lips too?
Before you grind down the feed lips, disassemble it again and see if you install everything properly. I don't understand how it could sit a few mm's higher if everything was done correctly. check all the screws and make sure they are snug. I've never taken the top portion apart yet but could the feed lips be in backwards?
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