Matthew,
I 'd suspect the mag. Feed lips inadvertently bent who knows when? Spring incorrect strength? Presuming you are not talking about its ejecting a pseudo-round already in the chamber--which, of course, it's supposed to do--it sounds as if the breechblock is dragging on that first round in such a way as to get it flipped directly out of the action, not achieving its intended resting place in the chamber. The mag lips may be spread a bit too far apart, allowing the round to ride a bit too high. Cycling it quickly by hand--closer to recoil operation than slower hand cycling--might allow it to skid by without flipping the round out; but considering that is happening at all indicates the need for adjustment.
You may soon hear from G.T., our Majesty of Mags. He may blow my story here entirely out of the water, but at least I can leave you confident that you will receive sage, expert advice from him.
David Parker
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