I doubt there would be many IIS'ers with the requisite license to have a semi-automatic shotgun (Vermin/feral control or primary producer), though you never know.
Basically any semi-automatic firearm can fire out of battery if faulty of design or poorly maintained. I have seen top of the line Brownings do it. I have seen several M1 Garands do it, and I had it happen to me with an M1 Carbine.
Semi automatics require stringent cleaning and greasing. I can almost guarantee the reason this firearm fired out of battery was due to insufficiently maintained gas system/mechanisms.
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