Since it only happens on the first round loaded, which is the last round loaded in the magazine, I was thinking about what makes this round different. One difference is that it is not pushed further up the tube by a following round, so maybe it’s not sitting in the right place in the magazine and moving into the action too soon or too late.
Try pushing that last round a bit further into the mag with another round or something similar, then let it come back, and see if that changes anything.
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