Stevens 320 not firing

[little buck 72]

First time to the range and after just five rounds I reloaded and it would not fire again. Cycled and retried but just clicked and did not connect to the primer. Any clues would help.

[PhilC]

Did the firing pin strike the primers on the rounds that just went click? If yes, was the indent the same or different than the rounds that fired?

[J.Baker]

If no indentation on the primer it could very well be a busted firing pin.