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I've had this problem with two other new Mossberg pumps. The problem was caused by the two shell interrupters having sharp points that dragged on the case heads--thus tying things up.
Dis-asemble, clean thoroughly, and break the edge of the interrupter ends and then polish same. You can do all this with medium coarse or coarse grit sandpaper and polish with fine grit. Just make sure the ends do not snag on the case heads.
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