Ok well I have a brand new MOSSBERG 500A. I installed a sixshot sidesaddle and noticed that it would not cycle as the pump was stopped by the sidesaddle. I then just cut a small part off the pump handle and now the thing wont insert a round. I pump it back and the shell sitting in the magazine wont release. I press the release and then I have to pry the shell (dummy) up into the chamber just to get it out. Not sure why this is happening. I am thinking that the shell bed (the silver piece that feeds the rds into the chamber) is not going down all the way or something is blocking the release from releasing the shell.