I use nothing but Magpul mags in my VFC SCAR - mostly 120 rnd PTS mags, but also a couple of 60 rnd green label units. None of them give me troubles.
I would suggest you avoid going after your rifle with any kind of tool, until you've exhausted all other attempts at solving the problem. That hop up unit is proprietary, and you don't want to do anything that would require replacing it.
Just a suggestion...
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