I had the same issue with my King Arms M4 when I first got it. I was able to fix the issue after I replaced the hopup rubber with a PDI w hold and got new mags. The brunt of the issue was caused by the poor feeding of the King Arms high-cap mag that the gun came with.
You however have said you have tried other mags. What are you using to test it now? King Arms rifles are picky with the mags you use and specifically how they seat.
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