Hi Everyone, I am a new member here. This is my first pump action shotgun. I am not new to shooting but I am new to pumps. Anyways I would load the shells into the mag tube and when I racked the pump the shells would intermittently feed into the chamber. I would fire and rack the pump and no shell would feed so I would rack it again and then it would feed. Now it won't feed at all. I finally was able to get the shells out of the mag tube. I have maybe 50 frustrating rounds through it. I spoke to Mossberg and they want me to ship it to Maverick Arms in Texas. It would extract and eject perfectly fine once a shell was fired. Any ideas what might be wrong? The gun shop installed a Mesa Tactical side saddle.