Having trouble with my old rem 870. I suspect that the fore-end arms are out of alignment (bent or worn) or there is something wrong with my ejector. When I rack the slide, the action jams at the point where it wants to eject spent hull and cycle a new round into the chamber. The result is much resistance and a little nip being taken out of the lip on the brass. I have stripped and reassembled the shotgun after a thoruogh cleaning but the problem persists. This problem is not on every round but frequent enough to cause a total lack of faith in the weapon's reliability..... a bad thing as this is my bear defense gun. Thanks in advance to anyone with advice on a solution to this problem.