Hold the charge handle and let it move forward slowly, watch the tip.
It is probably hitting the feed ramps. I would try Pmags or HK mags to get the bullet tips angled up a little higher, HKs are expensive but you get what you pay for.
Also there is a mag spring tweak to put more pressure on the front of the follower.
5.56, 6.8, SIX5. The Nexgen of 308s
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