I had an 870 Express that would do that a lot. There was no safety issue, but the problem was that it would come back enough that you didn't have a lot of travel left to get the slide going enough to positively eject the spent shell unless you really slammed it back. And if you ran it forward a little to get a better "running start", it was easy to go too far and it'd lock in battery with an empty shell in the chamber forcing me to press the slide release to cycle the action. It was again, not a safety issue, but it was very obnoxious. My Browning BPS never had this problem. It'd stay in battery through recoil until I actually racked the slide. I miss that Browning. [:@]

Mike