When I got my 870 two years ago, I had the same problem of spent shells not ejecting. For me, the forend would be stuck in place (chamber closed) for 5-10 seconds after a shot. Then it would magically become unstuck and the gun would function normally. In fact, I have several buddies with recent production 870's who had the same problem. Mabey QA problems on the line?
Anyway, I use the gun for upland game and the failure to eject was a real pain for follow up shots. For me, the problem turned out to be the ammo. I was using Winchester and Federal shells. I switched to Remington Heavy Game Load shells and have not had the problem since. It might work for you.
Good luck, and let us know how it turns out.
TJ
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