Possibly could depend on how old the shotgun is. My grandpa had a Sears & Roebuck bolt action shotgun that my dad talked about as a kid that had a firing pin issue. He talked about how it could go off with a sudden jolt to the shotgun like when they were jumping over a fence. My uncle has sense had a gunsmith work on the shotgun to fix the problem as well as restoring this family heirloom that I would shoot as a kid as well.
This. I was also thinking slam fire