I had to take my Shotgun apart to replace the firing pin.
Now it will load the first round into the chamber and Fire, but the Magazine will not accept a round.

The Mag Tube will take shells when the shotgun is apart, but not when together.
I think there is a lever that helps unload the shells that is bent, but I can't remember if it is Normal to be that way.

I have an arrow pointing at the bend, but it is not a great image as I only took the pic with my phone camera.

I got it back together, Firing Pin replaced and a spare feed latch, thanks to a US pal of mine.
FISMA if you are reading this I O U big time.

So you got it all working now?