Avoid high cap magazines unless they're brand names like TM or CA. The most reliable feeding will usually come from real or low-cap, followed by midcaps. I personally use low and mids, and never had feed problems. The stock JG highcap I got with my 416 is horrible. Doesn't matter what gun I put it in, I have feed problems.
And in the end, you're better off with low and mid caps, because some games won't allow the use of high-cap.
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