First, on the barrel it has 3 stars. What does that mean?
It means that the barrel has a modified choke.
Also, the shells won't exit the magazine upon cycling the action manually. You have to actually shoot the gun, and I'll bet it works fine. If you want to unload the magazine you have to press the cartridge interruptor/catch with your thumb to let each one out.
I actually prefer this method as it's easy to unload the chamber and replace with another shell, or for safety. The magazine won't release another shell until the barrel moves rearward under recoil.