i just bought a NIB mossberg 590. I got it home and loaded up the tube, and then began to cycle it (pump it). It failed to feed at least 1/3 of the time. The new shell would not release out of the tube. I removed the spring and reinstalled it and FTF. I tried to call Mossberg but they were closed for the weekend... Help please?????????????any suggestions on what I can do. I can fix it if you can explain it....thank you