One other thought, the tube feed ones have what is called a cartridge stop and a cartridge interrupter mounted into the receiver. Check that they are working properly, jack the action open, if the shell does not move onto the carrier, push down on the interrupter tab to see if the shell now releases into the carrier. There are some very good schematics on line, the Mossberg Store has some great ones, if you don't recognise what I am talking about.
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