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What was happening with the gun before this happened? Working normally?
I'd almost bet that its the elevator. Its a known issue with this model. Try this- reach up inside and hit the bolt release from the inside. That should allow the elevator to drop down, and thus allowing the bolt to release.Try that and tell me if it clears the issue...Jim
Ok, so the elevator drops down and the bolt is still stuck?
Ok, thank you for the picture. I'm not seeing anything that jumps out at me...the elevator issue has been reported numerous times, so I thought that may have been what was happening with yours. Unfortunately, its hard for me to diagnose the issue too much more without seeing the gun in person. I think at this point, you may want to have it looked at by a gunsmith, or consider sending it back to Mossberg.
New Zealand? Is that where you are?