This happened to one of the shooters on shotgun competition. Firing pin on his Benelli Supernova stuck in forward position and slamfire discharge occured when he pushed forend forward loading shell into a chamber.

The problem was in firing pin. It is little deformed (probably from dry-fire trainings). That caused it to stuck in forward position. It looks like the metal is too soft and easy to deform:

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Common Problem of Fabarm Shotguns: Broken Firing Pin

Off-topic today. Here is what happened to Fabarm shotgun of one of the shooters on recent training:

Fabarm Shotgun: Broken Firing Pin
Fabarm Shotgun: Broken Firing Pin

Broken firing pin is very common problem of Fabarm shotguns.

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